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Abstract

Identification and prevention of drug-related problems have become the central role of patient-centered pharmacy practitioners. After the initiation of patient-oriented pharmacy service, many studies evaluating magnitude of drug-related problems at facility level in Ethiopia have been conducted, though the extent of the problem at a national level remains unknown. Hence, this systematic review and meta-analysis is undertaken with the aim of quantifying the prevalence of drug-related problems in Ethiopian public healthcare settings using Cipolle/Strand classification system. Electronic databases were searched including PubMed, EMBASE, Web of Science, MEDLINE and HINARI, Google Scholar and ResearchGate for both published and unpublished works. Data on study characteristics and outcomes were extracted using the format developed on Microsoft Excel. The primary measure was the pooled prevalence of drug-related problems. The meta-analysis was conducted using OpenMeta[Analyst].A total of 17 studies were included in this systematic review and meta-analysis. The pooled prevalence of drug-related problems of patients who experienced at least one drug-related problem during their therapy was found to be 69.4% (95% confidence interval: 61.5–77.4). The most frequently reported types of drug-related problems were “need for additional drug and “noncompliance,” together accounting for more than half of the drug-related problems. The most frequently reported factors associated with drug-related problems were patients’ age, polypharmacy, comorbidities and the number days of hospital stay.The prevalence of drug-related problems in Ethiopian public healthcare settings was found to be high. Inconsistent reporting of drug-related problems was observed across the studies. It is imperative to design and implement interventions aimed at reducing drug-related problems. Responsible stakeholders should adopt uniform drug-related problem classification approach to ensure uniform reporting of drug-related problems in Ethiopian healthcare settings

Keywords

Ethiopia review drug-related problem drug therapy

Introduction

The introduction of the concept of pharmaceutical care resulted in an ambition to apply a new philosophy of pharmacy practice.¹ According to its creators Hepler and Strand, “Pharmacists must abandon factionalism and adopt patient-centered pharmaceutical care as their philosophy of practice,” as they phrased it and continued “Pharmacy’s re-professionalization will be completed only when all pharmacists accept their social mandate to ensure the safe and effective drug therapy of the individual patient.”² Pharmaceutical care requires pharmacists to work with other healthcare professionals to assess, initiate, monitor and modify medication use to ensure the safety and effectiveness of drug therapy. Identifying, resolving and preventing drug-related problems (DRPs) are, therefore, considered to be cornerstones in pharmaceutical care.³

DRP refers to any undesirable event experienced by a patient that involves drug therapy and hinders achieving the desired therapeutic goals.⁴ Many classification systems have been developed to categorize DRPs based on the nature of errors and/or outcomes of the events.⁵ The ABC classification,⁶ the American Society of Hospital Pharmacists classification, ⁷ the Cipolle/Morley/Strand classification,⁴ the Granada Consensus,⁸ the Hanlon Approach,⁹ the Pharmaceutical Care Network Europe (PCNE) classification¹⁰ and the Hepler–Strand classification² are some of the notable DRP classification systems that exist to this day.

The Cipolle/Morley/Strand classification of DRPs has been widely used. According to this system, DRPs are classified into seven categories based on the nature of discrepancies that led to their occurrence: unnecessary drug therapy, need for additional drug therapy, ineffective drug therapy, dose too high, dose too low, adverse drug reaction (ADR) and noncompliance.⁴ If not resolved, DRPs can result in harmful clinical outcomes ranging from temporary minor symptom exacerbations to permanent disability or death.¹¹ In addition to unwanted clinical outcomes, the economic impact of DRPs is excessive. Additional hospitalizations, law suit costs, infections acquired during hospital visits, lost income, medical and disability expenses cost some countries between US$6 billion and US$29 billion each year.^12,13

It is estimated that in the developed countries, 1 in 10 patients is harmed while receiving hospital care and the major causes of the harm are DRPs. In developing countries, the probability of patients being harmed because of DRPs is higher than that in the industrialized nations.¹³ Countless occurrences of DRPs are encountered every day because of the rapidly expanding array of drug products available, the growing number of diseases being identified and diagnosed, as well as the increasing number of patients entering the healthcare system.¹⁴ Furthermore, especially in developing countries, poorly developed healthcare facilities, shortage of well-trained professionals, unavailability and unaffordability of essential drugs as well as a high prevalence of infectious diseases contribute to the higher prevalence of DRPs and associated harmful outcomes.^15,16

Patient-related factors such as polypharmacy, comorbidities, prolonged hospital stay and extremes of age have been identified as risk factors for the occurrence of DRPs.^14,17,18 Hence, identifying risk factors, timely medication therapy review and taking correction measures for identified DRPs are important to reduce the harmful outcomes of DRPs.^19–22 Data about the prevalence of DRPs in a healthcare system would be useful to plan and implement strategies to reduce the incidence and resolve a DRP before it harms the patient. Hence, this systematic review and meta-analysis was undertaken with the aim of quantifying the prevalence of DRPs and identifying commonly encountered types of DRPs in Ethiopian healthcare settings. This is expected to provide insight for the healthcare providers on the extent of DRPs and types of DRPs that need caution during their practice.

Methods

Review protocol

The protocol for the study was developed before the commencement of the review and it is available on reasonable request from the principal author. The Preferred Reporting Items for Systematic review and Meta-analysis (PRISMA) checklist was used for conducting and reporting this review. In addition, we used PRISMA flow diagram to depict the process of identification, screening for eligibility and final inclusion.²³

Eligibility criteria

Original research articles that evaluated the magnitude of DRPs were included in the study. There were no restrictions on publication year, but only studies that were written in English and conducted in Ethiopian public healthcare settings were considered for inclusion without time limitation. Studies that identified DRPs using Cipolle/Morley/Strand DRPs classification algorism⁴ were included to ensure comparability. Studies with insufficient outcome measures or studies with outcomes of interest are missing or vague were excluded.

Data source and search strategy

The search was conducted in January 2020 (while the look for newly published articles continued until the review process was completed) on PubMed, EMBASE, Web of Science, MEDLINE and HINARI using the following keywords and indexing terms: “Drug related problems,” “Drug therapy problems,” “Medication related problems” and “Ethiopia.” Google Scholar and ResearchGate search was also conducted to identify other relevant published and unpublished works including dissertations, institutional repositories and organizational manuals, among others. Boolean operators (AND, OR) and truncation were used when appropriate to increase the number of relevant findings. In addition, we searched for the articles listed in the references of the retrieved articles to identify further relevant studies.

Study selection

The records retrieved from different databases were exported to EndNote version 9. The original articles identified using the search strategy were subject to screening by two reviewers, Y.A. and Z.T., independently after removing duplicate files. Initially, the articles were screened based on the title and abstract. Then the full text of each included based on the title and abstract article was screened for eligibility based on the established criteria.

Data extraction and outcome measurement

A data extraction format was developed on Microsoft Excel to extract the study characteristics and outcomes. Study characteristics such as study setting, study design, year of publication, study subjects, sample size, DRP classification and data source were extracted. The primary outcome measure was the magnitude of DRP prevalence. Moreover, the types of DRPs, the mean number of DRPs and factors associated with DRPs were accessed.

Study quality assessment

The quality of the studies, which fulfilled the inclusion criteria, was checked prior to data extraction using the Joanna Briggs Institute Prevalence Critical Appraisal Tool for prevalence studies.²⁴ The instrument has 10 criteria with “Yes,” “No,” “Unclear” and “Not applicable” options. The mean score of the two authors was used for decision on the inclusion of each article, and studies with less than 50% score were excluded. Furthermore, the GRADE (Grading of Recommendations, Assessment, Development and Evaluations) is used to grade the quality of each article. GRADE method has four levels of quality of evidence: very low, low, moderate and high.²⁵

Data processing and statistical analysis

The extracted data were exported from Microsoft Excel to OpenMeta[Analyst] software for the analysis of outcome measures and sub-grouping. The pooled prevalence of outcomes was calculated assuming DerSimonian-Laird random-effects model at 95% CI. The significance of heterogeneity of the studies was assessed using I²statistics based on I² percent variation across the studies. The presence of publication bias was assessed using funnel plots. A statistical test with a p value of less than 0.05 was considered significant.

Results

Study selection

To assess the magnitude of DRPs in Ethiopian public healthcare settings, our search identified 488 records, out of which 48 were duplicate titles. After evaluating the articles based on the titles and abstracts, 420 articles were excluded. Twenty-one articles were considered relevant based on titles and abstracts. These were further screened based on the established inclusion criteria and quality assessment. Finally, 17 articles were considered to be of good quality and included in the systematic review (Figure 1).

Figure 1.

PRISMA flow chart of literature search and study inclusion criteria.

Summary of study characteristics

Table 1 depicts the characteristics of the 17 studies included in the present systematic review and meta-analysis. All the studies included were published since 2015 and conducted using cross-sectional study design through medical record review and/or face-to-face patient interview. Regarding the study areas, two studies were conducted in Northern part of Ethiopia,^31,36 six were conducted in the capital city, Addis Ababa,^{14,18,27,34,38,39} and four were from Western Ethiopia, Jimma.^26,32,33,35 The remaining were from Southern Ethiopia and Eastern Ethiopia. The lion’s share of studies were conducted on a single disease such as diabetes mellitus^{30,33,37,39,40} and hypertension.^29,36 The sample size in the included studies ranged from 103³⁵ to 418.³⁹ The prevalence of DRPs ranged from 42.3%³⁹ to 88.0%.³⁷ The mean number of DRPs per patient varied from 0.68¹⁴ to 2.6.³² The risk of bias was assessed using Joanna Briggs Institute Prevalence Critical Appraisal Tool (JBI) for prevalence studies. Majority of articles included scored at least 70%. In addition, the quality of evidence of each article was evaluated using GRADE approach and most of the articles was rated as low quality (the result for both JBI and GRADE evaluation is provided as supplementary file).

Table 1.

Characteristics of studies conducted on drug-related problems in Ethiopia.

Studies	Year of publication	Study area	Study setting	Study design	Study subject	Sample size	Source of data	Prevalence of DRPs (%)	Total DRPs	Mean DRPS per patient
Yadesa et al.²⁶	2015	Jimma, Western Ethiopia	Medical ward of a single hospital	CS	Patients prescribed with antibiotics	152	Record review and patient interview	75.7	206	1.4
Sisay et al.^a,27	2015	Addis Ababa, Central Ethiopia	Oncology unit of a single hospital	CS	Cancer patients	367	Record review	74.7	474	1.3
Ayalew et al.^a,14	2015	Addis Ababa, Central Ethiopia	Medical ward of a single hospital	CS	All patients	225	Record review	52.0	152	0.68
Kaleab Gizaw²⁸	2017	Bonga, Southern Ethiopia	Ambulatory clinic of a single hospital	CS	CVS patients	130	Record review and patient interview	72.0	163	1.5 ± 0.8
Abadir and Daba²⁹	2017	Dire Dawa, Eastern Ethiopia	Ambulatory clinic of a single hospital	CS	HTN patients	271	Record review and patient interview	71.2	378	1.4 ± 1.3
Hailu et al.³⁰	2017	Wolaita, Southern Ethiopia	Ambulatory clinic of a single hospital	CS	T2DM patients	243	Record review and patient interview	83.1	378	1.8 ± 0.7
Belayneh et al.³¹	2018	Dessie, Northern Ethiopia	Medical ward of a single hospital	CS	All patients	147	Record review and patient interview	75.5	159	1.1
Niriayo et al.³²	2018	Jimma, Western Ethiopia	Ambulatory clinic of a single hospital	CS	HF patients aged >18 years	340	Record review and patient interview	83.5	880	2.6 ± 1.8
Mohammed et al.³³	2018	Jimma, Western Ethiopia	Ambulatory clinic of a single hospital	CS	T2DM with HTN	300	Record review and patient interview	82.0	494	1.6 ± 1.1
Birarra et al.^a,34	2018	Addis Ababa, Central Ethiopia	Pediatric ward of a single hospital	CS	All patients	285	Record review	31.6	106	0.37
Aster et al.³⁵	2019	Jimma, Western Ethiopia	Medical ward of a single hospital	CS	CKD patients	103	Record review and patient interview	78.6	200	1.9 ± 0.9
Asgedom et al.³⁶	2019	Mekelle, Northern Ethiopia	Ambulatory clinic of a single hospital	CS	HTN patients	241	Record review and patient interview	55.6	357	1.5
Argaw et al.³⁷	2019	Bale, Southern Ethiopia	Ambulatory clinic of a single hospital	CS	T2DM patients	216	Record review and patient interview	88.0	446	2.1 ± 0.9
Malede et al.³⁸	2019	Addis Ababa, Central Ethiopia	Pediatric Oncology ward of a single hospital	CS	All patients	156	Record review and patient interview	68.6	257	1.6
Demoz and Berha^a,39	2019	Addis Ababa, Central Ethiopia	Ambulatory clinic of a single hospital	CS	T2DM patients	418	Record review and patient interview	42.3	207	1.16 ± 0.4
Abdulmalik et al.^a,40	2019	Harar, Eastern Ethiopia	Ambulatory clinic of a single hospital	CS	T2DM patients	148	Record review	64.2	127	0.9
Nasir et al.^a,18	2020	Addis Ababa, Central Ethiopia	Ambulatory clinic of a single hospital	CS	Epilepsy patients	291	Record review and patient interview	70.4	352	1.2 ± 0.4

DRP: drug-related problem; CS: cross-sectional; CKD: chronic kidney disease; HTN: hypertension; T2DM: type 2 diabetes mellitus; CVS: cardiovascular disease.

Adherence was not included as a part of DRP.

Prevalence of drug-related problems

A meta-analysis of 17 studies was conducted to estimate the pooled prevalence of DRPs. Accordingly, it was found that 69.4% (95% CI: 61.5–77.4) of patients experienced at least one DRP during their therapy. There was a significant heterogeneity across the studies, as it was indicated by the I² value of 97.22%, p < 0.001 (Figure 2).

Figure 2.

Forest plot showing the pooled prevalence of 17 studies reporting drug-related problems in Ethiopia.

Subgroup analysis

We conducted subgroup analysis based on DRP classification. Studies lacking adherence as a part of DRP, as recommended by Cipolle/Morley/Strand DRPs classification algorism, and those studies that reported all seven types of DRP were analyzed separately. Not surprisingly, studies that reported all types of DRP had significant higher pooled prevalence of DRP with 77% (95% CI: 72–82; Figure 3) compared to the studies that excluded adherence 55.9% (95% CI: 41.3–70.4; Figure 4).

Figure 3.

Forest plot showing the pooled prevalence of studies included adherence in their DRP reporting.

Figure 4.

Forest plot showing the pooled prevalence of studies excluded adherence in their DRP reporting.

We also conducted subgroup analysis to explore sources of heterogeneity and to evaluate whether there was significant difference in magnitude of DRP between ambulatory and inpatient settings. Pooled prevalence of DRP in ambulatory setting was higher than that of inpatient wards’ with 75.8% and 60.5%, respectively. There was significant heterogeneity in both settings (Figures 5 and 6). Only few studies were included in this meta-analysis; the heterogeneity observed might have been caused by random variation.

Figure 5.

Subgroup analysis of studies conducted in inpatient setting, Ethiopia.

Figure 6.

Subgroup analysis of studies conducted in ambulatory setting, Ethiopia.

Pooled prevalence of each drug-related problems category

In this section, we only included studies that reported DRP adhering strictly to Cipolle/Morley/Strand DRPs classification algorism. Eleven studies were analyzed for this section. Accordingly, “need for additional drugs” was the most frequently reported type of DRP, accounting for 33% (95% CI: 26%–39%), followed by “noncompliance,” 21% (95% CI: 15%–27%). “Dosage too high” and “adverse drug reaction” were the least frequently reported types of DRP, accounting for 4% each with CIs of (95% CI: 3%–6%) and (95% CI: 2%–5%), respectively (Table 2).

Table 2.

Pooled prevalence of drug therapy problems presented in seven categories.

Types of DRPs	Ev/Trt	Pooled estimate 95% CI	I ²
Needs additional drug	1281/3918	0.33 (0.26–0.39)	94.46
Noncompliance	791/3918	0.21 (0.15–0.27)	96.67
Dosage too low	675/3918	0.15 (0.09–0.22)	98.24
Ineffective drug therapy	533/3918	0.10 (0.05–0.15)	97.64
Unnecessary drug therapy	296/3918	0.09 (0.06–0.11)	93.81
Dosage too high	156/3918	0.04 (0.03–0.06)	90.94
Adverse drug reaction	146/3918	0.04 (0.02–0.05)	91.28

DRP: drug-related problem; CI: confidence interval.

Factors associated with drug therapy problems

The literatures included reported a wide variety of factors as risk factors for the occurrence of DRPs. The most frequently reported factors were patients’ age,^31,33,34,38 number of medications (polypharmacy)^30,29,32,37 and polymorbidity.^{29,30,32,33,36,37,39} In addition, the number of days of hospital stay^38,33 a prior history of hospitalization,³⁰ the level of patients involvement in the therapeutic decision and their belief about medication,³² as well as the stage of the disease (severity),³⁷ were reported to have association with the occurrence of DRPs.

Publication bias

Analysis for publication bias using funnel plot (logit event rate vs standard error) revealed that there was no publication bias (Figure 7).

Figure 7.

Funnel plot analysis for publication bias in the studies conducted on drug-related problem in Ethiopia.

Discussion

Although drugs are the cornerstone of modern medicine, they could sometimes be the causes of unwanted and harmful patient outcomes or DRPs.⁴¹ Hence, looking out for potential DRPs, minimizing their effect and taking corrective measures are some of the essential activities which involve the interactive work of physicians and pharmacists.⁴²

In this systematic review, 69.4% (95% CI: 72%–82%) of patients were reported to have at least one DRP. In the subgroup analysis, the prevalence of DRP was high among studies conducted in ambulatory unit compared to inpatient. This might be due to lack of strict follow-up and monitoring for ambulatory patients. This review shows not only an alarmingly high number of DRPs, but also a wide variation from studies conducted elsewhere. For instance, a study conducted in Hong Kong reported only 21.0% incidence of DRPs.⁴³ Attention should be given on reducing the occurrence of DRPs considering its impact on patient treatment outcomes and associated financial costs.

Understanding types of DRP gives added value in the effort of preventing their occurrence as well as dealing with their effects. Cipolle/Morley/Strand classify DRPs into seven categories, namely, needs additional drug, unnecessary drug use, ineffective drug therapy, dosage too high, dosage too low, ADR and noncompliance.⁴ In the current review, the most commonly reported types of DRP were found to be “Need for additional drug,” followed by “Noncompliance,” accounting for more than half of the DRPs. According to the authors, “need for additional drug” can occur in the face of diagnosis without an indication, or need for additive drug or preventive drug. Similarly, “noncompliance” could be an indicator of lack of access to prescribed drugs due to unaffordability and unavailability, failure to understand instructions and difficulty in administration. Thus, practitioners should consider such factors cautiously during their daily encounters.

On the contrary, ADR was reported as the least frequent type of DRP, with an incidence of 4% (95% CI: 2%–5%). This figure might not show the real picture of the burden of ADRs. This is because detecting ADR is often challenging as sign and symptoms of a disease may overlap with the manifestations of an ADR. Furthermore, all studies included in this review were conducted through document review and patient interview. These approaches have inherent downside when it comes to detecting ADRs, as there might be unrecorded ADR in patient charts and the potential for patient recall bias. In certain cases, laboratory tests might be needed to detect ADR. Therefore, this finding should be interpreted cautiously as there is a potential for underestimation.

Although factors associated with the occurrence of DRPs vary depending on the likes of the setting where research was conducted and study population, a variety of factors have been reported as a risk for DRPs. Examples of risk for DRPs indicated in the literatures included patient age, polypharmacy, polymorbidity, patient cognitive condition and the types of medication used (the risk is high with drugs such as antiepileptics, anticoagulants).^44,45 In this review, most of the studies included reported age of patients as a risk factor for DRPs. This can be explained by the likely increased number of comorbidities in elderly population; prescribers’ tendency of overlooking drug selection and dosing guidelines for geriatric patients; and socio-economic and behavioral changes that emerge with aging, such as financial constraints and forgetfulness.

Similarly, patients diagnosed with more than one disease were reported to have higher risk of developing DRPs. This could be due to the fact that patients with multiple comorbidities are more likely to receive larger number of medications. This brings us to the issue of polypharmacy, which is also reported to have a significant association with DRPs as patients on multiple drugs were at high risk of experiencing DRPs. However, it should be noted that the cutoff number of drugs used to declare polypharmacy was varied across the studies reviewed. Thoroughly assessing patients’ medical history as well as undertaking medication reconciliation can significantly reduce DRPs related to multiple comorbidities and polypharmacy.

Looking at the study characteristics, nearly all studies conducted on DRP were published 2015 onward, converging with the initiation of patient-oriented pharmacy service in Ethiopia. Such an exploding number of research outputs are expected to play a vital role in the full implementation of clinical pharmacy services in Ethiopia and improve the overall quality of the service. The majority of the studies used Cipolle/Morley/Strand classification of DRPs with the exception of few studies which used PCNE classification approach.^46,47 While there are several types of DRP classification, there is no single most effective DRP categorization approach based on applicability, comprehensiveness and internal consistency.⁴⁸ Although different classification approaches are used across countries, it is very important to adopt a single classification to ensure the consistency of practice and reporting. In addition, modification of the adopted classification system should be considered for special groups of patients such as the elderly.⁴⁹

Furthermore, we witnessed incomplete reporting and deviation from the selected DRP classification system. For instance, rather than reporting “adherence” as one type of DRP, the authors reported it separately.¹⁸ Other studies reported drug–drug interaction as a separate DRP.^14,18 In fact, according to Cipolle/Morley/Strand classification, drug–drug interaction is a cause of DRPs such as ineffectiveness, high or low dosage. Future studies should take this into consideration as it will not only create inconsistency across studies, but also make it difficult to interpret and use the generated information.

Moreover, a considerable number of studies were conducted in the ambulatory ward assessing DRPs in chronic care patients such as diabetes mellitus and hypertension. While these types of studies are expected to improve the pharmacotherapy of chronic diseases that are becoming a common healthcare problem in the country, equal attention should be given to DRPs occurring in inpatient wards to gain insight into the whole picture of the problem.

Limitation

We were not able to find pooled magnitude of each factor associated with DRPs because of wide variation in statistics used to report the findings. Furthermore, this systematic review included observational studies with low to moderate quality of evidence and should be interpreted accordingly. Drugs commonly involved in DRPs were not assessed in this review because only few of the studies included in this review reported drugs involved in the DRPs. Despite the limitations, the findings of this review provide a new set of information on the extent of the problem at national level.

Conclusion

The review shows a high prevalence of DRPs in Ethiopian public healthcare settings. Need for additional drug and noncompliance were most frequently reported DRPs. It is imperative to design and implement interventions aimed at reducing DRPs. One possible solution is to actively engage clinical pharmacy practitioners in the patient care process. In addition, responsible stakeholders should adopt a uniform DRP classification approach to ensure uniform reporting of DRPs. Future studies should consider the suitability of selected DRP classification for the study settings.

Supplemental Material

sj-doc-1-smo-10.1177_20503121211009728 – Supplemental material for Drug-related problems in Ethiopian public healthcare settings: Systematic review and meta-analysis

Supplemental material, sj-doc-1-smo-10.1177_20503121211009728 for Drug-related problems in Ethiopian public healthcare settings: Systematic review and meta-analysis by Yohanes Ayele and Zelalem Tilahun Tesfaye in SAGE Open Medicine

Supplemental Material

sj-pdf-2-smo-10.1177_20503121211009728 – Supplemental material for Drug-related problems in Ethiopian public healthcare settings: Systematic review and meta-analysis

Supplemental material, sj-pdf-2-smo-10.1177_20503121211009728 for Drug-related problems in Ethiopian public healthcare settings: Systematic review and meta-analysis by Yohanes Ayele and Zelalem Tilahun Tesfaye in SAGE Open Medicine

Supplemental Material

sj-pdf-3-smo-10.1177_20503121211009728 – Supplemental material for Drug-related problems in Ethiopian public healthcare settings: Systematic review and meta-analysis

Supplemental material, sj-pdf-3-smo-10.1177_20503121211009728 for Drug-related problems in Ethiopian public healthcare settings: Systematic review and meta-analysis by Yohanes Ayele and Zelalem Tilahun Tesfaye in SAGE Open Medicine

Supplemental Material

sj-pdf-4-smo-10.1177_20503121211009728 – Supplemental material for Drug-related problems in Ethiopian public healthcare settings: Systematic review and meta-analysis

Supplemental material, sj-pdf-4-smo-10.1177_20503121211009728 for Drug-related problems in Ethiopian public healthcare settings: Systematic review and meta-analysis by Yohanes Ayele and Zelalem Tilahun Tesfaye in SAGE Open Medicine

Footnotes

Acknowledgements

We would like to extend our appreciation to the authors who cooperated with us through giving additional information regarding their articles.

Declaration of conflicting interests

The author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.

Funding

The author(s) received no financial support for the research, authorship, and/or publication of this article.

ORCID iD

Yohanes Ayele

Supplemental material

Supplemental material for this article is available online.

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