Abstract
Directive (European Union (EU)) 2024/1203 establishes a harmonized legal framework for prosecuting environmental crimes within the EU, closing regulatory loopholes and enhancing ecosystem protection. It defines environmental unlawfulness as a key element of criminal offenses, preventing fraudulent authorizations from justifying harmful practices. The directive extends criminal liability to gross negligence, targeting reckless behaviors that cause irreversible environmental damage. By reinforcing the duty of care, it combats systemic environmental harm. Additionally, it reduces legal disparities across Member States, preventing regulatory arbitrage and reducing polluters ability to evade liability, thereby strengthening environmental accountability across the EU.
Keywords
Introduction
Environmental protection is a fundamental objective of the European Union (“EU” or “the Union”), enshrined at the core of its founding treaties. Aware of escalating environmental challenges, the Union has progressively developed a robust legal framework aimed at ensuring a high level of ecosystem and natural resource preservation. This commitment is first expressed in Article 3(3) of the Treaty on European Union (TEU), which explicitly affirms the Union's obligation to strive for “a high level of protection and improvement of the quality of the environment.” 1 This objective underscores an institutional recognition of the intrinsic link between environmental protection and sustainable development, integrating the ecological dimension as a fundamental imperative alongside economic and social considerations. Furthermore, Article 191 of the Treaty on the Functioning of the European Union (TFEU) defines the guiding principles and key priorities of the Union's environmental policy. It establishes a series of fundamental objectives, including the preservation and improvement of environmental quality, the protection of human health, the sustainable use of natural resources, and the response to environmental challenges on both regional and global scales, particularly in relation to climate change. 2 These objectives reflect a holistic approach to environmental protection—one that extends beyond the mere conservation of natural resources to encompass proactive risk management and the anticipation of global ecological crises.
In this context, Directive (EU) 2024/1203 of the European Parliament and of the Council, 3 adopted on 11 April 2024, marks a decisive turning point in the repression of environmental crime within the EU. For the first time, the EU establishes an autonomous legal framework that explicitly defines a broad range of offences—from unlawful pollution to fraudulent waste management and the destruction of protected habitats—and requires Member States to attach effective sanctions to each. This Directive represents a clear departure from earlier approaches, which were often fragmented and heavily reliant on national law, by creating a genuinely autonomous body of environmental criminal law at the EU level. Directive 2024/1203 now harmonizes the typology of punishable conduct by specifying, for each offence, the material elements, the requisite intent, and, where applicable, the standard of negligence, thereby clarifying the criteria for criminal liability. By addressing legal gaps that currently contribute to impunity and by strengthening cross-border cooperation in investigation and prosecution, the EU sends an unequivocal message: environmental protection is not merely a political imperative, but a legal obligation underpinned by uniform and deterrent sanctions, aimed at preventing and effectively punishing serious harm to natural resources and biodiversity.
This note focuses exclusively on the section of Directive (EU) 2024/1203 relating to criminal offences, offering a targeted analysis of its key provisions and their practical implications. While mechanisms of judicial cooperation, rules on jurisdiction, and the range of sanctions are all essential components for ensuring the effectiveness of the EU framework, it is crucial to begin by examining the very core of the legal instrument: the definition and classification of punishable conduct. Indeed, by crystallizing a uniform typology of offences, the Directive seeks to address disparities between national legal systems, facilitate the detection and prosecution of cross-border environmental crimes, and strengthen the criminal liability of both public and private actors. This analysis will examine the material elements, mental states (intent), and standards of negligence as defined in the Directive, with a view to highlighting the main challenges—ranging from divergent interpretations and evidentiary thresholds to institutional capacity—as well as the opportunities it creates, such as the diffusion of best practices and the enhancement of investigative tools. It will thus assess the extent to which Directive 2024/1203 effectively contributes to the harmonization of environmental criminal law and the broader fight against ecological crime within the EU. Against this background, the analysis is structured in two parts: the first outlines the context leading to the adoption of this new legal instrument, while the second offers a detailed examination of the substance of Directive 2024/1203, with particular attention to its innovations in defining environmental offences.
Background
The EU has established a comprehensive legal and policy framework to implement the environmental principles and objectives enshrined in the TEU and TFEU. In response to the climate emergency and increasing pressures on ecosystems, the EU has adopted an integrated approach aimed at ensuring effective environmental protection while fostering the sustainable transformation of its economy and society. This strategy combines ambitious legislative measures with economic incentives to promote development that respects ecological imperatives. In this context, the Union launched a new green growth strategy in 2019: The European Green Deal. 4 This ambitious initiative aims to make the EU a net-zero greenhouse gas emissions society by 2050, marking a strong commitment to combating climate change. It extends beyond mere emissions reduction, encompassing a wide range of policies designed to protect, preserve, and restore the Union's natural heritage while improving the quality of life and health of its citizens in the face of environmental risks. The objective is to fundamentally rethink the European economic model to achieve carbon neutrality without compromising business competitiveness or exacerbating social inequalities. 5 As part of the Green Deal, the Union has adopted legally binding instruments to translate these objectives into concrete commitments. Among them, the European Climate Law, adopted by the European Parliament in 2021, represents a major breakthrough. It makes the goal of reducing greenhouse gas emissions by 55% by 2030 legally binding and enshrines the 2050 climate neutrality target in EU law. 6 This law is complemented by a set of regulations, directives, and policies designed to structure European action on energy transition and environmental protection, notably through the reform of the carbon market and the acceleration of renewable energy deployment.
However, despite these legislative advances and ambitious commitments, significant challenges remain regarding the effective enforcement of the environmental measures adopted by the Union. The effectiveness of such policies depends not only on the quality of the adopted standards but also on their concrete implementation by Member States and the compliance of the relevant economic actors. Yet, several obstacles continue to hinder this process, including resistance from certain industrial sectors and shortcomings in sanction mechanisms. The Union itself acknowledges that “the existing systems of penalties have not been sufficient to achieve complete compliance with the laws for the protection of the environment.” 7 In response to this situation, it has emphasized that environmental protection “should be strengthened by the availability of criminal penalties, which demonstrate a social disapproval of a qualitatively different nature compared to administrative penalties or a compensation mechanism under civil law.” 8 The criminal law approach is increasingly valued in the literature, particularly for its enhanced deterrent effect. The effectiveness of environmental regulation can largely depend on the ability of legal systems to enforce violations effectively, and criminal sanctions—more so than administrative fines—can signal a genuine normative shift capable of influencing the behavior of potential polluters. 9 The adoption of criminal sanctions thus serves a dual purpose: first, it aims to punish the most harmful environmental offenses by classifying them as serious crimes, on par with other forms of criminality; second, it fosters greater accountability among economic and industrial actors by integrating environmental considerations into their risk management strategies. With this objective in mind, the Union adopted Directive 2008/99/EC on the protection of the environment through criminal law. 10 This directive requires Member States to incorporate effective, proportionate, and dissuasive criminal sanctions into their national legislation against activities that cause serious harm to the environment. These sanctions must apply to offenses that result in, or are likely to result in, substantial degradation of air, soil, and water quality, as well as harm to fauna and flora. 11 The overarching goal is to combat intentional pollution, the illegal discharge of hazardous substances, and threats to the conservation of protected species, ensuring that perpetrators of such offenses face sufficiently severe penalties to prevent recidivism and deter future violations.
However, although Directive 2008/99/EC represented a significant step forward in the criminalization of environmental offenses, its implementation remains inconsistent across Member States. Some countries delayed transposing its provisions into their national legal systems, while others maintained sanctions that were either insufficiently severe or rarely enforced. Considering the increasing scale of environmental harm and the persistent gaps in the prosecution of ecological offenses, the Union has adopted a new directive to strengthen its legal framework. On 11 April 2024, the EU adopted Directive (EU) 2024/1203 on the protection of the environment through criminal law, 12 which repeals and replaces Directive 2008/99/EC. This new instrument reflects the EU's commitment to strengthening the legal tools available to combat environmental crime by imposing stricter obligations on Member States regarding the criminalization of environmental harm. By expanding the list of behaviors constituting criminal offenses, the directive aims to ensure more effective protection of ecosystems. It also responds to the increasing prevalence of transnational and organized environmental crime, which requires enhanced cooperation between national authorities and European institutions.
Directive (EU) 2024/1203
Directive (EU) 2024/1203 represents a major advancement by establishing an autonomous criminal framework for environmental protection. Unlike Directive 2008/99/EC, which provided only indirect and subordinate protection based on compliance with administrative regulations, the new directive enshrines the existence of independent environmental offenses, detached from any prior violation of administrative law. Directive 2008/99/EC did not directly recognize the environment as a legally protected interest in itself; rather, it conditioned criminal liability on the existence of a prior illegality, defined by the violation of legislation listed in Annex A (adopted under the EC Treaty), Annex B (adopted under the EURATOM Treaty), or domestic law transposing these legislations. 13 This approach prioritized administrative law as the primary tool for regulating human activities impacting the environment. Through authorizations, permits, standards, and administrative sanctions, administrative law was intended to regulate industrial and economic practices to limit harm to ecosystems. The underlying rationale was that if public authorities set regulatory standards, then the role of criminal law was merely to enforce compliance—that is, to sanction non-compliance with administrative rules. In this system, the conditions for criminal liability were determined by administrative law. Thus, an economic operator causing environmental damage while complying with administrative regulations could not be held criminally liable. In this context, what criminal law sanctioned regarding environmental harm was not so much the pollution itself as the breach of administrative rules. This situation does not pose a problem as long as administrative law ensures adequate environmental protection. However, this regulatory model is based on a balance between environmental protection and economic imperatives, often leading to compromises that are unfavorable to the environment. Environmental impact assessments, while necessary, are frequently influenced by economic considerations, thereby diminishing their protective scope. As a result, although administrative law has long been the primary tool for environmental protection, it no longer provides sufficient safeguards against contemporary ecological challenges.
In response to these limitations, Directive (EU) 2024/1203 strengthens environmental protection by introducing an autonomous system of criminal liability for environmental harm. It thus breaks away from the logic of administrative dependency, which had previously conditioned criminal enforcement on violations of administrative norms. This shift reflects a growing recognition of the inadequacy of administrative mechanisms and the need for a more stringent criminal instrument to effectively combat environmental crimes. The autonomy of environmental offenses established by this directive is based on a distinct legal framework, no longer exclusively grounded in the traditional definitions of criminal law within Member States but rather in the objectives of the Union's environmental policy. Consequently, environmental criminal law is evolving towards the recognition of specific offenses, distinct from conventional criminal categories, by fully integrating concerns related to ecosystem preservation and the fight against severe ecological damage. Directive (EU) 2024/1203 marks a decisive step in this transformation by establishing a clear and precise definition of environmental crime, based on criteria adapted to the realities of environmental harm. This autonomy relies primarily on two fundamental elements. First, unlawfulness becomes the essential condition for environmental criminal offenses, recognizing the intrinsic value of the environment as a legally protected interest. Second, the directive introduces a crucial distinction in the characterization of criminal liability by differentiating intentional misconduct from gross negligence. By incorporating this distinction, the directive strengthens the scope of environmental criminal liability, allowing for a more precise assessment of punishable conduct. It thus considers both the degree of culpability and the severity of environmental harm, ensuring a legal response that is better aligned with contemporary ecological challenges.
Environmental unlawfulness as an essential condition for criminal offenses
Directive (EU) 2024/1203 precisely establishes the essential condition for qualifying conduct as an environmental criminal offense. The central element of this qualification is unlawfulness, which serves as a decisive criterion for engaging an actor's criminal liability. This principle ensures that only serious environmental harm, in violation of established norms, can be subject to appropriate criminal sanctions. 14 Under the directive, unlawfulness is defined by a twofold condition. First, “conduct shall be unlawful where it breaches Union law which contributes to pursuit of one of the objectives of the Union's policy on the environment.” 15 This approach enshrines an integrated reading of environmental law by directly linking criminal enforcement to applicable European norms. Consequently, an environmental offense is defined in relation to EU standards and obligations governing ecosystem protection, waste management, pollution control, and biodiversity conservation. This method guarantees the harmonization of criminal classifications at the European level, preventing discrepancies between national legal systems from creating disparities in the prosecution of environmental offenses. Second, unlawfulness is also recognized when a behavior violates “a law, regulation or administrative provision of a Member State, or a decision taken by a competent authority of a Member State, which gives effect to the Union law.” 16 In other words, a criminal offense may arise from the breach of national legal frameworks insofar as they give effect to EU environmental rules. This provision ensures that Member States remain bound by the obligations set by the EU and that non-compliance with a national norm based on European law can lead to criminal prosecution. Through this dual definition, the directive strengthens the relationship between Union law and national legislation, ensuring the harmonization of criminal rules while maintaining the ability of Member States to adapt their legal frameworks according to their specific environmental contexts.
One of the fundamental principles enshrined in Directive (EU) 2024/1203 is that the unlawful nature of conduct does not disappear merely because it has been authorized by a competent administrative authority. First, the Directive explicitly states that a behavior remains unlawful “even where it is carried out under an authorisation issued by a competent authority of a Member State if such authorisation was obtained fraudulently or by corruption, extortion or coercion.” 17 In such cases, the illegality of the authorization taints all actions deriving from it, thereby exposing their perpetrators to criminal sanctions. This provision is essential for combating institutional abuses and corruption networks that facilitate polluting or destructive activities under the guise of administrative legality. Second, the Directive clarifies that holding an administrative authorization does not exempt the holder from criminal liability “if such authorisation is in manifest breach of relevant substantive legal requirements.” 18 The phrase “in manifest breach of relevant substantive legal requirements” should be understood as referring to a clear and substantial violation of essential obligations established under the applicable environmental legal framework. It does not extend to procedural irregularities or minor deficiencies affecting the issued authorization. 19 In other words, only a clear and significant breach of a substantive norm that has a material impact on environmental protection can trigger the criminal liability of the authorization holder.
This distinction aims to prevent a purely formal approach to the prosecution of environmental offenses and to focus enforcement efforts on the most serious threats to ecological balance and the fundamental principles of environmental law. Thus, an authorization obtained fraudulently or under conditions that are manifestly contrary to legal requirements cannot legitimize environmentally harmful conduct. The approach adopted by the Directive is crucial in preventing administrative abuses and strategies designed to circumvent criminal sanctions in environmental matters. By preventing companies from exploiting administrative loopholes to evade their obligations and by restricting the ability of public authorities to shield offenses under the pretext of authorizations issued in violation of Union law, the Directive strengthens the effectiveness of the legal framework. Similarly, it neutralizes attempts by polluters to shield themselves from liability by invoking irregular authorizations, particularly in cases where economic considerations take precedence over environmental imperatives. This approach thus ensures a more rigorous application of environmental law and reduces the risk of impunity for actors involved in serious harm to ecosystems.
The strict regulation of administrative authorizations is not limited to combating fraud or blatant abuses. Even when an authorization is lawfully granted, its holder remains bound to comply with all applicable environmental obligations. Directive (EU) 2024/1203 explicitly states that where an authorization is required, “the fact that the authorisation is lawful does not preclude criminal proceedings against the holder of the authorisation where that holder does not comply with all obligations of the authorisation or with other relevant legal obligations not covered by the authorisation.” 20 Thus, compliance with the specific conditions of an authorization does not exempt an actor from criminal liability if other relevant legal obligations are violated. This requirement aims to ensure effective environmental protection by preventing a lawfully granted authorization from becoming a pretext to circumvent fundamental regulations. Accordingly, the lawful nature of an authorization does not exclude criminal liability in cases of breaches of legal obligations. For instance, an industrial facility operator may adhere to the emission limits set by its authorization while simultaneously violating other regulations concerning waste management or the protection of endangered species. Such conduct may result in criminal sanctions, irrespective of prior administrative approval. This approach strengthens the effectiveness of environmental criminal law by imposing greater accountability on economic and institutional actors, requiring them to comply with the full spectrum of legal obligations rather than merely the specific terms of a granted authorization. It thereby contributes to ensuring more rigorous environmental protection by preventing regulatory loopholes from being exploited to evade fundamental ecological responsibilities. This strict regulation of authorizations reflects the EU's broader commitment to ensuring effective accountability in environmental protection.
Intention and the gradation of offences
Beyond its unlawfulness, a behavior constitutes an environmental criminal offense when it is committed intentionally—that is, when the perpetrator was aware of the unlawful nature of their action and deliberately engaged in that act. 21 Intentionality is a central criterion in classical criminal law, which is based on the notion of a conscious will to violate a legal rule. The element of intent thus implies that the perpetrator was aware of the legal prohibition and nonetheless chose to disregard it. This deliberate will can manifest in several ways, notably through a direct action aimed at violating an environmental rule (for example, the illegal disposal of toxic waste while being fully aware of its hazardous nature) or through the conscious acceptance of the environmental risk associated with a certain behavior (such as operating an industrial facility without the necessary safety measures, knowing that this could lead to pollution). However, not all intentional offenses exhibit the same degree of severity. Some environmental harm, due to its scale or irreversible nature, requires a more severe criminal classification. To ensure a response proportionate to the gravity of the damage caused, Directive (EU) 2024/1203 introduces a distinction between basic environmental offenses and those that, due to their substantial impact on ecosystems and natural resources, must be considered qualified criminal offenses.
From this perspective, Directive (EU) 2024/1203 represents a significant advancement in the enforcement of environmental offenses by clarifying and expanding the scope of conduct subject to criminal sanctions. Member States are now required to classify as a criminal offense any unlawful and intentional behavior that substantially harms the environment. 22 The expansion of the environmental criminal framework introduced by the directive is based on a detailed list of prohibited acts, covering a broad range of activities that may cause severe damage to ecosystems, biodiversity, and human health. These behaviors include, among others, the release and emission of pollutants into air, soil, and water; the placing on the market of prohibited products; the use or commercialization of hazardous substances; and the illegal operation of high-risk industrial facilities. 23 One of the fundamental aspects of Directive (EU) 2024/1203 is its explicit recognition of the cumulative and systemic effects of environmental offenses. It does not limit itself to acts of immediate and visible pollution but also takes into account behaviors that may pose significant long-term environmental risks. Consequently, activities such as the illegal treatment or transfer of waste, non-compliant ship recycling, pollutant discharges from ships, and the unsafe management of radioactive materials fall within the scope of this reinforced legislation. 24 By adopting this approach, the EU avoids fragmented and inconsistent enforcement across Member States.
Directive (EU) 2024/1203 establishes a gradation of environmental offenses based on the severity of the damage caused. While any unlawful and intentional behavior constitutes a basic criminal offense, the Directive requires Member States to classify certain behaviors as qualified criminal offenses when the resulting damage reaches a particularly high threshold of severity. This distinction allows sanctions to be tailored to the nature and extent of environmental harm, ensuring a more proportionate and deterrent enforcement approach. An intentional offense is classified as “qualified” when the act in question results in “the destruction of, or widespread and substantial damage which is either irreversible or long-lasting to, an ecosystem of considerable size or environmental value or a habitat within a protected site.” 25 Additionally, the Directive designates as “qualified criminal offenses” intentional acts that cause “widespread and substantial damage which is either irreversible or long-lasting to the quality of air, soil or water.” 26 This provision reflects the EU's commitment to imposing harsher penalties on offenses that jeopardize vital environmental resources essential for ecosystems and human populations. By introducing this aggravated classification, the Directive acknowledges that certain forms of pollution have systemic and long-term effects, impacting not only the natural environment but also public health and economic activities dependent on natural resources. The classification of “qualified criminal offenses” thus aims to reinforce enforcement against the most severe environmental harm, while emphasizing the importance of preserving ecological balance and the resilience of ecosystems in the face of anthropogenic pressures. By requiring Member States to differentiate between ordinary environmental offenses and qualified criminal offenses, Directive (EU) 2024/1203 adopts an approach based on the severity of harm and the need for a proportionate criminal response. This distinction ensures enhanced protection for the most vulnerable natural environments and essential environmental resources, while promoting greater harmonization of sanctions across the EU. In doing so, the Directive enshrines a logic of aggravated penalties for the most destructive environmental offenses, reaffirming the central role of criminal law in combating major ecological crimes and preserving ecosystems for future generations.
Directive (EU) 2024/1203 represents a significant step forward by explicitly referring to ecocide as a particularly severe form of environmental criminal offense. It states that “those qualified criminal offences can encompass conduct comparable to ‘ecocide’ […],” 27 thereby recognizing widespread and irreversible destruction of ecosystems as a central concern in environmental criminal law. This recognition aligns with an international movement, where several states have already incorporated ecocide into their national legislation, and discussions are ongoing to establish it as an international crime on par with crimes against humanity and war crimes. By incorporating this concept into its legal framework, the EU takes a proactive stance on ecosystem protection while ensuring heightened enforcement against the most destructive environmental offenses. Thus, by explicitly mentioning ecocide, Directive (EU) 2024/1203 not only strengthens the EU's environmental criminal framework but also contributes to the evolution of international law toward the universal recognition of ecocide as a crime, thereby reinforcing the EU's commitment to environmental preservation for future generations.
Serious negligence and environmental offences
Directive (EU) 2024/1203 does not limit the enforcement of environmental offenses to intentional acts alone but also expands the scope of criminal law to include negligent conduct in certain circumstances. Accordingly, it provides that unlawful behavior may constitute a criminal offense “when carried out with at least serious negligence.” 28 This approach allows for the prosecution of reckless or irresponsible behavior that, while not intentional, causes significant environmental harm or creates a serious risk of such harm. Member States are thus required to ensure that certain specific behaviors, enumerated in the Directive, 29 constitute criminal offenses even in the absence of a deliberate intent to violate the law. This provision is based on a broader concept of criminal liability, encompassing not only deliberate acts of pollution and environmental destruction but also conduct resulting from a flagrant breach of due diligence and precautionary obligations. For instance, an industrial operator who fails to install the necessary safety mechanisms to prevent a toxic spill, or a company that does not comply with hazardous waste management regulations, could incur criminal liability even in the absence of an explicit intent to cause environmental harm. Directive (EU) 2024/1203 highlights several aggravating factors that increase criminal liability for environmental offenses, particularly when they result from gross negligence. Thus, unlawful and unintentional conduct will be subject to criminal sanctions if it “causes the death of, or serious injury to, persons, substantial damage or a considerable risk of substantial damage to the environment or is considered otherwise to be particularly harmful to the environment.” 30 By incorporating these criteria, the Directive seeks to anticipate severe environmental harm and sanction irresponsible behavior that could lead to disastrous consequences. This approach aims to prevent environmental damage rather than merely repairing it after it has occurred. It ensures a more effective response to environmental offenses, which often result from a lack of vigilance or failure to take necessary precautions rather than from a deliberate intent to cause harm.
Conclusion
Directive (EU) 2024/1203 represents a decisive step in the development of an autonomous legal framework for the prosecution of environmental crimes within the EU. It introduces a structured and harmonized approach to the criminal protection of the environment, aiming to more effectively sanction serious harm to ecosystems and natural resources. One of the directive's major innovations is the establishment of environmental unlawfulness as an essential condition for criminal offenses, ensuring a rigorous definition of punishable conduct. By specifying that certain environmental harms remain sanctionable even when an administrative authorization has been fraudulently obtained or granted in violation of fundamental environmental law principles, the directive closes loopholes that might otherwise allow actors to evade criminal liability. This approach ensures stronger protection for natural environments against the most serious offenses, preventing harmful practices from being legitimized through abusive administrative authorizations or regulatory gaps. In parallel, the interaction between intentional misconduct and gross negligence in environmental criminal liability represents a significant evolution in European criminal law. Previously limited to voluntary offenses, environmental criminal law now encompasses reckless and irresponsible conduct, which, though not intentional, causes or seriously exposes the environment to irreversible damage. By extending criminal liability to acts resulting from a flagrant lack of diligence or manifest failure to take precautions, the directive reinforces the duty of care for economic, industrial, and institutional actors. This expansion enables more effective enforcement against diffuse and systemic environmental harm, which—though induced by negligent management—can be just as destructive as intentional offenses. By harmonizing definitions of environmental offenses across Member States, the directive also helps reduce legal disparities that previously allowed strategic circumvention of national regulations. This standardization is crucial to preventing jurisdictions from imposing overly lenient sanctions, which could create low-enforcement zones that foster impunity for those responsible for large-scale pollution or ecosystem destruction. Directive 2024/1203 introduces specific sanctions aimed at strengthening deterrence and harmonizing punitive measures across Member States. These new provisions include mandatory minimum prison sentences for natural persons and substantial fines for legal entities. By establishing a common foundation for criminal enforcement, the directive promotes a coherent and strengthened approach to environmental criminal law across the EU. However, the effective implementation of these new provisions will depend on Member States’ ability to transpose these standards into their national legislation and ensure their strict enforcement. 31 The effectiveness of this reform also hinges on the capacity of national courts to handle these complex offenses, which require advanced technical expertise and an interdisciplinary approach.
Footnotes
Funding
The author received no financial support for the research, authorship, and/or publication of this article.
Declaration of conflicting interests
The author declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.
