Efficacy and safety comparison of Helicobacter pylori eradication between vonoprazan dual therapy versus triple therapy: a systematic review and meta-analysis

Abstract

Background:

As a novel drug, vonoprazan (VPZ) has been developed as a new strategy against Helicobacter pylori (H. pylori) infections. However, whether VPZ + amoxicillin (AMO) dual therapy has a clear advantage is still unclear.

Objective:

To review and meta-analyze the available literature investigating the efficacy and safety of H. pylori eradication in VPZ dual therapy.

Design:

A systematic review and meta-analysis were conducted.

Data sources and methods:

We performed a systematic search in the PubMed, Embase, EIsevier/Science Library, and Cochrane Library databases from 2015 to 2022. Meta-analyses were conducted to evaluate the actual cure rate and the incidence rate of adverse reactions in dual therapy and VPZ + AMO + clarithromycin (CLA) triple therapy; furthermore, eradication rates in CLA-resistant infections and different doses of antibiotics were evaluated in subgroup analysis.

Results:

Seven studies with 1490 patients were included in this meta-analysis. According to intention-to-treat analysis, the actual cure rates of VPZ dual and triple therapy were 82.8% and 84.6%, respectively [p = 0.29, odds ratio (OR): 0.86, 95% confidence interval (CI): 0.64–1.14]. And in the per-protocol analysis, the actual cure rates of these two therapies were 84.8% and 87.0%, respectively (p = 0.21, OR: 0.80, 95% CI: 0.57–1.13). The incidence of adverse reactions between VPZ dual and triple therapy was 26.1% versus 29.6% (p = 0.04, OR: 0.78, 95% CI: 0.61–0.99). In subgroup analysis, the eradication rates in CLA-resistant infections were dual therapy: 85.7% for VPZ versus 71.0% for triple therapy (p = 0.03, OR: 2.36, 95% CI: 1.10–5.05). And the actual cure rate of VPZ with high-dose antibiotics was lower than with low-dose antibiotics (p = 0.000 in dual therapy; p = 0.011 in triple therapy).

Conclusion:

A combination of VPZ and a low dose of AMO should be prioritized as a treatment option for H. pylori eradication.

Registration:

PROSPERO registration number CRD42022346100.

Keywords

dual therapy eradication therapy vonoprazan

Introduction

Helicobacter pylori (H. pylori) affects more than half of the global population and is considered a common pathogen causing chronic gastritis, peptic ulcers, gastric cancer, and gastric mucosa-associated lymphoid tissue lymphoma, which causes serious harm to human health.^1–3 Since H. pylori-associated gastritis was defined as an infectious disease in the Maastricht V Consensus report, clinicians focused on the actual cure rates of H. pylori infections and adverse reactions rates of its therapies.⁴

Proton pump inhibitor (PPI) and two antibiotics, with or without bismuth, are mostly used for the eradication of H. pylori infections in Japan, Europe, and America.^5–7 Although two antibiotics ensure the cure rate of H. pylori infections above 90% as much as possible, the actual cure rate of H. pylori has decreased owing to increasing antimicrobial resistance, especially clarithromycin (CLA), metronidazole, and levofloxacin. It has been reported that the antimicrobial resistance rate of H. pylori to CLA is 20–50%, to metronidazole is 40–70%, and to levofloxacin is 20–50% in China.^8–11 At the same time, the adverse reactions caused by taking two antibiotics and the higher costs are problems too. So dual therapy composed of a PPI and amoxicillin (AMO) has attracted increasing attention since 1989.¹² Unfortunately, there were many differences in the efficacy of such therapies in previous studies. Kayser et al.¹³ reported that the actual cure rate of H. pylori was only 23%, but Shirai et al.¹⁴ reported that the actual cure rate was up to 90.9%. These findings may be attributed to the dosage and pharmacokinetics of the drugs; however, they still limited the use of PPI-based dual therapy in clinic.

As a novel potassium-competitive acid blocker, vonoprazan (VPZ) has been developed and gained increasing attention.^15,16 VPZ noncovalently combines with K+/H+-ATPase through hydrogen and ionic bonds, competing for acting sites of K+ and inhibiting the conformational change of the K+/H+-ATPase, which leads to enzyme inactivation, eventually reducing gastric acid secretion. According to a recent randomized controlled trial (RCT) reported in Japan,¹⁵ VPZ provides a stronger and longer-lasting effect on gastric acid suppression than other PPIs. Therefore, its application in the treatment of H. pylori infections is expected to improve the actual cure rate of H. pylori infections. A meta-analysis by Jung et al.¹⁷ showed that the actual cure rates of VPZ-containing versus PPI-containing first-line triple therapies were 85.1% versus 68.0% in an intention-to-treat (ITT) analysis, and there was a significant difference between the two groups [relative risk (95% confidence interval), CI = 1.19 (1.15–1.24)]. The safety of VPZ versus PPI for H. pylori eradication therapies showed that there was no significant difference [RR (95% CI) = 1.02 (0.78–1.34)]. Therefore, VPZ may be an alternative to PPI as an eradication therapy for H. pylori infections.

Obviously, problems such as antimicrobial resistance increased; serious side effects and high costs are also associated with VPZ triple therapy. VPZ provides quicker, stronger, and longer-lasting effects on gastric acid suppression compared to PPIs. Therefore, we expect better efficacy of dual therapy composed of VPZ and AMO.¹⁸ We also expect VPZ dual therapy not to contribute to the development of H. pylori antibiotic resistance. However, many studies have reported that the efficacy and safety of VPZ dual therapy were similar to triple therapy, even though VPZ dual therapy was recommended, but with high-dose antibiotics. And only a few studies have reported the actual cure rate of VPZ dual therapy and triple therapy in CLA-resistant infections, so we wanted to perform a meta-analysis to discuss whether the VPZ + AMO dual therapy has a clear advantage over VPZ + AMO + CLA triple therapy.

Materials and methods

Literature search strategy

This study was conducted according to the PRISMA checklist 2020 for reporting systematic reviews and meta-analyses (Figure 1; Supplemental file). The review protocol was registered in advance on PROSPERO under registration number CRD42022346100 (see https://www.crd.york.ac.uk/prospero). A systematic literature search was conducted using the PubMed, Embase, EIsevier/Science Library, and Cochrane Library databases up to 20 June 2022. We used the following keywords: ‘vonoprazan’ OR ‘potassium-competitive acid blocker’ OR ‘P-CAB’ OR ‘TAK-438’ AND ‘Helicobacter pylori’ OR ‘Helicobacter nemestrinae’ OR ‘Campylobacter pylori’ for retrieval. All of the above works were independently completed by two researchers.

Figure 1.

Flowchart of materials and methods: the literature search.

Study selection criteria

The inclusion criteria were as follows: (i) The study was a RCT comparing the efficacy and safety of VPZ-based dual therapy and VPZ-based triple therapy; (ii) the study confirmed H. pylori infections by rapid urease tests or¹³C-urea breath tests; (iii) the study confirmed H. pylori eradication by¹³C-urea breath tests after treatment for 1 month; (iv) the study used 7-day therapies; and (v) the study included more than 30 patients in each group. The study was not included if any of the exclusion criteria were met.

The exclusion criteria were as follows: (i) The study was a meta-analysis, review, letter, or case report; (ii) the study contained incomplete or had unavailable data; (iii) the study did not have the full-text accessible; and (iv) the study focused on healthy people, animals, or other diseases.

Data extraction

We read every detail of the included studies carefully and extracted the following information and data from each study: (i) the first author’s name and the study publication year; (ii) the study type and treatment strategy; (iii) the sample size; (iv) the actual cure rate and incidence of adverse reactions to H. pylori treatments; and (v) all figures, images, and other data. Whole works were completed by two researchers independently.

Study quality assessment

According to the Cochrane Review Handbook (Version 6.2), we conducted a quality assessment on every RCT included in the study. The following items of each RCT were evaluated: (i) the methods of random allocation; (ii) whether and how the participants and researchers were blinded; (iii) whether and how the outcome assessors were blinded; (iv) whether there were missing data and how to deal with missing data; (v) whether there was a protocol deviation and how to deal with it and (vi) whether there were other biases.

Statistical analysis

Review Manager 5.4.1 (provided by the Cochrane Collaboration, 2020) was used for statistical analysis in our meta-analysis. We compared the following data using a likelihood-ratio χ²-test, odds ratios (ORs), and 95% CIs: (i) the actual cure rates of VPZ-based dual therapy and VPZ-based triple therapy and (ii) the incidence of adverse reactions between the two groups. We estimated the heterogeneity of each study using the I² test and considered an I² < 25% to indicate that no heterogeneity existed; otherwise, subgroup analysis or a randomized effect model was used. In all analyses, a p < 0.05 was considered to indicate significant difference.

Results

Literature search

The search identified 288 studies that were retrieved from the PubMed, Embase, EIsevier/Science Library, and Cochrane Library databases, of which seven studies^19–25 were included for analysis (Figure 1). Characteristics of the included studies for meta-analysis are presented in Table 1. All patients were diagnosed as infected by H. pylori using a¹³ C-urea breath test. Demographic and clinical characteristics were similar between the two groups. In total, in this meta-analysis, there were 686 patients that received VPZ + AMO dual therapy, and 804 patients that received VPZ + AMO + CLA triple therapy. According to the Cochrane Review Handbook, the overall risk of bias assessed by the QUADAS-2 tool was low in the seven included studies, and the details are presented in Figure 2.

Table 1.

Characteristics of studies included in meta-analysis.

First author, year	Journal	Study design	Diagnostic basis	Patients number	Eradication regime
First author, year	Journal	Study design	Diagnostic basis	Patients number	Duplex therapy	Triple therapy
Furuta et al.¹⁹	American Journal of Gastroenterology	RCT	¹³C-urea breath test	61	VPZ 20 mg bid + AMO 500 mg tid for 1 week	VPZ 20 mg bid + AMO 750 mg bid + CLA 200 mg for 1 week
Furuta et al.²⁰	Clinical Pharmacology and Therapeutics	RCT	¹³C-urea breath test	32	VPZ 20 mg bid + AMO 500 mg tid for 1 week	VPZ 20 mg bid + AMO 750 mg bid + CLA 200 mg for 1 week
Furuta et al.²¹	Gastroenterology	RCT	¹³C-urea breath test	67	VPZ 20 mg bid + AMO 500 mg tid for 1 week	VPZ 20 mg bid + AMO 750 mg bid + CLA 200 mg for 1 week
Furuta et al.²²	Digestion	RCT	¹³C-urea breath test	112	VPZ 20 mg bid + AMO 500 mg tid for 1 week	VPZ 20 mg bid + AMO 750 mg bid + CLA 200 mg for 1 week
Suzuki et al.²³	Gut	RCT	¹³C-urea breath test	335	VPZ 20 mg bid + AMO 750 mg bid for 1 week	VPZ 20 mg bid + AMO 750 mg bid + CLA 200 mg for 1 week
Gotoda et al.²⁴	Japanese Society of Gastroenterology	Prospective observational study	¹³C-urea breath test	221	VPZ 20 mg bid + AMO 750 mg bid for 1 week	VPZ 20 mg bid + AMO 750 mg bid + CLA 200 mg for 1 week
Chey et al.²⁵	Gastroenterology	RCT	¹³C-urea breath test	662	VPZ 20 mg bid + AMO 1 g tid for 1 week	VPZ 20 mg bid + AMO 1 g bid + CLA 500 mg bid for 1 week

AMO, amoxicillin; bid, twice a day; CLA, clarithromycin; RCT, randomized controlled trial; tid, three times a day; VPZ, vonoprazan.

Figure 2.

Assessment of risk of bias of included studies.

Comparison of actual cure rates between dual and triple therapies

One retrospective study²³ used a propensity score matching analysis and considered it to provide an equivalent degree of evidence as an RCT, so we classified it as an RCT. In the ITT analysis, the actual cure rates of H. pylori were 82.8% and 84.6% between dual therapy and triple therapy, respectively (p = 0.29, OR: 0.86, 95% CI: 0.64–1.14; Table 2(a)). And in a per-protocol (PP) analysis, there was still no statistical differences between the two therapies (84.8% versus 87.0%; p = 0.21, OR: 0.80, 95% CI: 0.57–1.13; Table 2(b)).

Table 2.

Forest plot of efficacy and safety of H. pylori eradication between two therapies.

a.
Study or subgroup	VPZ duplex therapy		VPZ triple therapy		Weight	OR M-H. Random. 95% CI	OR M-H. Random. 95% CI
Study or subgroup	Events	Total	Events	Total	Weight	OR M-H. Random. 95% CI	OR M-H. Random. 95% CI
Chey et al.²⁵	250	324	273	338	58.0%	0.80 (0.55–1.17)
Furuta et al.¹⁹	15	16	14	16	1.3%	2.14 (0.17–26.33)
Furuta et al.²⁰	28	30	28	31	2.3%	1.50 (0.23–9.68)
Furuta et al.²¹	30	32	33	35	2.0%	0.91 (0.12–6.86)
Furuta et al.²²	52	56	51	56	4.3%	1.27 (0.32–5.02)
Gotoda et al.²⁴	51	60	132	161	12.3%	1.24 (0.55–2.81)
Suzuki et al.²³	142	168	149	167	19.7%	0.66 (0.35–1.26)
Total (95% CI)		686		804	100.0%	0.86 (0.64–1.14)
Total events	568		680
Heterogeneity: τ² = 0.00; χ² = 2.74, df = 6 (p = 0.84); I² = 0%
Test for overall effect: Z = 1.05 (p = 0.29)

b.
Study or subgroup	VPZ duplex therapy		Vomoprazan triple therapy		Weight	OR M-H. Random. 95% CI	OR M-H. Random. 95% CI
Study or subgroup	Events	Total	Events	Total	Weight	OR M-H. Random. 95% CI	OR M-H. Random. 95% CI
Chey et al.²⁵	215	265	240	280	55.5%	0.72 (0.45–1.13)
Furuta et al.²²	51	54	51	55	4.8%	1.33 (0.28–6.26)
Gotoda et al.²⁴	51	59	132	157	15.6%	1.21 (0.51–2.85)
Suzuki et al.²³	142	163	148	164	24.1%	0.73 (0.37–1.46)
Total (95% CI)		541		656	100.0%	0.80 (0.57–1.13)
Total events	459		571
Heterogeneity: τ² = 0.00; χ² = 1.59, df = 3 (p = 0.66); I² = 0%
Test for overall effect: Z = 1.26 (p = 0.21)

c.
Study or subgroup	VPZ duplex therapy		Vomoprazan triple therapy		Weight	OR M-H. Random. 95% CI	OR M-H. Random. 95% CI
Study or subgroup	Events	Total	Events	Total	Weight	OR M-H. Random. 95% CI	OR M-H. Random. 95% CI
Chey et al.²⁵	104	348	118	346	59.1%	0.82 (0.60–1.13)
Furuta et al.²²	9	56	14	56	6.9%	0.57 (0.23–1.46)
Gotoda et al.²⁴	6	60	32	157	7.0%	0.43 (0.17–1.10)
Suzuki et al.²³	46	168	51	167	27.0%	0.86 (0.53–1.38)
Total (95% CI)		632		726	100.0%	0.78 (0.61–0.99)
Total events	165		215
Heterogeneity: τ² = 0.00; χ² = 2.21, df = 3 (p = 0.53); I² = 0%
Test for overall effect: Z = 2.02 (p = 0.04)

d.
Study or subgroup	VPZ duplex therapy		VPZ triple therapy		Weight	OR M-H. Random. 95% CI	OR M-H. Random. 95% CI
Study or subgroup	Events	Total	Events	Total	Weight	OR M-H. Random. 95% CI	OR M-H. Random. 95% CI
Chey et al.²⁵	37	40	32	42	30.7%	3.85 (0.98–15.23)
Suzuki et al.²³	35	44	39	58	69.3%	1.89 (0.76–4.73)
Total (95% CI)		84		100	100.0%	2.36 (1.10–5.05)
Total events	72		71
Heterogeneity: τ² = 0.00; χ² = 0.71, df = 1 (p = 0.40); I² = 0%
Test for overall effect: Z = 2.21 (p = 0.03)

The squares indicate individual studies. The diamonds represent pooled effect sizes. The dashed lines represent the 95% CIs. a: actual cure rate of H. pylori infection in ITT analysis; b: actual cure rate of H. pylori infection in PP analysis; c: safety of H. pylori eradication between two therapies; d: actual cure rate of H. pylori infection in CLA-resistant infections.

CI, confidence interval; CLA, clarithromycin; ITT, intention to treat; OR, odds ratio; PP. per protocol; VPZ, vonoprazan.

Safety comparison between dual and triple therapies

Only three studies^19–21 did not provide detailed information about adverse reactions. According to our analysis, the total incidence of adverse reactions was 26.1% for dual therapy and 29.6% for triple therapy, with a corresponding OR of 0.78 (95% CI: 0.61–0.99 p = 0.04; Table 2(c)) under the fixed-effect model. Diarrhea was a common adverse reaction in both therapies. And in terms of a single symptom, the incidence of diarrhea was lower in dual therapy, which had a significant difference compared to triple therapy (7.4% versus 11.0%; p = 0.026; Table 3). Furthermore, there was statistical difference (0.79% versus 2.62%; p = 0.011; Table 3) in the patients who discontinued treatment due to sever adverse reactions between two therapies.

Table 3.

Incidences of adverse events observed in the duplex or triple therapy groups [n (%)].

Adverse events	Duplex therapy (n = 632)	Triple therapy (n = 726)	p Value
Diarrhea	47 (7.4)	80 (11.0)	0.026*
Bloating	20 (3.2)	14 (1.9)	0.141
Constipation	11 (1.7)	8 (1.1)	0.312
Skin rush	12 (1.9)	12 (1.7)	0.721
Abdominal pains	14 (2.2)	9 (1.2)	0.161
Nausea	11 (1.7)	14 (1.9)	0.808
Treatment discontinuations	5 (0.8)	19 (2.6)	0.011*
Others	45 (7.1)	59 (8.1)	0.505

p < 0.05.

Eradication rates in CLA-resistant infections between dual and triple therapies

Only two studies provided detailed information about CLA-resistant infections. In these two studies, the CLA-resistant H. pylori infection rates were 19.6% and 22.5% (p = 0.295). Eradication rate in CLA-resistant H. pylori infections in dual therapy was higher than triple therapy (85.7% versus 71.0%; p = 0.03, OR: 2.36, 95% CI: 1.10–5.05 Table 2(d)).

Comparison of actual cure rates between different doses of antibiotics

We further performed a subgroup analysis on antibiotic dosing administration. We defined AMO 1500 mg and CLA 200 mg as low-dose administration and AMO 3000 mg and CLA 500 mg as high-dose administration. After analysis, we found that for dual and triple therapy the actual cure rate of high-dose antibiotics was lower than a low dose of antibiotics (p = 0.000 in dual therapy; p = 0.011 in triple therapy; Table 4).

Table 4.

Comparison of different dose antibiotics administration to H. pylori eradication [n (%)].

Therapy strategies	Dose of antibiotics	Eradicated		Eradicated (+)/%	p Value
Therapy strategies	Dose of antibiotics	Yes	No	Eradicated (+)/%	p Value
Duplex therapy	Low	318	44	87.8%	0.000***
	High	250	74	77.2%
Triple therapy	Low	407	59	87.3%	0.011*
	High	273	65	80.8%

p < 0.05; ***p < 0.001.

Discussion

Many studies²⁶ have suggested that VPZ is superior to PPI in H. pylori eradication treatment. According to Dong et al.²⁷ the actual cure rate of H. pylori infections was 92.6% for VPZ treatment and only 74.1% for PPI treatment, with a significant statistical difference. On one hand, VPZ can ensure a gastric pH above 7, preventing H. pylori from colonizing by inhibiting urease activity. Homeless H. pylori is more easily killed by antibiotics. On the other hand, VPZ can still inhibit acid secretion without the proton pump activated. This was a great difference from PPI. Through this mechanism, the acid secretion function of gastric epithelial cells can be inhibited more comprehensively and completely. Last but not least, the potent acid inhibition of VPZ is not influenced by CYP2C19 genotype, which is a well-known factor that failed for patients who eradicate H. pylori. Therefore, we suggested that the stronger, faster, and longer-lasting effect of VPZ on gastric acid suppression than PPI that was a crucial factor for VPZ to be a H. pylori eradication treatment candidate.

In this meta-analysis, we found that the actual cure rates of VPZ dual therapy and triple therapy were 82.8% versus 84.6% (p = 0.29) in ITT analysis and 84.8% versus 87.0% (p = 0.21) in PP analysis. This results are consistent with previous studies. However, we noticed that the actual cure rate of H. pylori infections with dual therapy was not more than 90%, which indicates low efficacy in the clinical setting according to the guidelines.^4,28,29 When we exclude the population from Europe and the United States, the actual cure rate of H. pylori infections was 90.0%, that meets the high efficacy standard recommended by the guidelines. We attributed this result to differences in the study population and suggested the VPZ is metabolized differently in different populations. The actual cure rates of H. pylori in western countries were not seen in Japanese trials with VPZ-based regimens of 90% or higher according to many studies. A non-randomized study³⁰ from Brown University showed that the most effective H. pylori eradication treatment only achieved a cure rate of 87%. And Chey et al.²⁵ wrote in his study that ‘in recent practice in the US, eradication rates of 90% or greater have been unattainable’. In clinical practice, doctors always increase the drug dosage to ensure the eradication rate. Then we further performed subgroup analysis on antibiotics dose administration. In our study, we noticed that the actual cure rate of low-dose antibiotics treatment was higher than that of high-dose antibiotics treatment in both dual and triple therapies. We considered AMO to be a time-dependent drug, reasonably increasing the frequency but not dose, which allows plasma concentration above the minimum inhibitory concentration and can ensure the efficacy of the drug to a greater extent. On the contrary, high-dose antibiotics increased adverse reactions that caused treatment discontinuations. This has also been demonstrated in our research.

At present, the antibiotic resistance of H. pylori is one of the non-negligible factors affecting the actual cure rate of H. pylori infections, especially for CLA. In 2017, the WHO³¹ published its first-ever list of antibiotic resistance ‘priority pathogens’, and CLA-resistant H. pylori was categorized as a high-priority bacterium, in the same tier as methicillin-resistant Staphylococcus aureus and vancomycin-resistant Enterococcus faecium. In our meta-analysis, CLA resistance rates were 19.6% and 22.5% in dual and triple therapies, respectively. And the treatment strategy in CLA-resistant H. pylori infection in our study suggested that VPZ dual therapy had a higher eradication rate. The H. pylori resistant to CLA mechanism was mutations in 23 SrRNA variable region genes. This leads to ribosome allostery, which reduced the affinity of the CLA binding site.³² For CLA-resistant H. pylori, frequent exposure to CLA increased the chance of gene mutation. This may increase the probability of mutations in genes encoding penicillin-binding proteins. Thus, that will decrease the efficacy of triple therapy. This needs further research to be proved, but does not significantly affect our conclusions.

Different from previous studies, we found that there was a statistical difference in adverse reaction rate between two therapies and even in triple therapy more patients discontinued treatment due to severe adverse reactions. Further research in terms of a single symptom, the highest incidence of adverse reactions, was for diarrhea. Macrolides, which stimulate increased intestinal motility, could explain the statistical difference and the incidence of diarrhea being the highest. Apart from this, that may be related to the effects of antibiotics on the gut microbiota. Many studies^33–35 have shown that the use of multiple antibiotics in H. pylori eradication therapy could lead to changes in the intestinal microecology, and the use of probiotics was recommended to alleviate this side effect. Although we did not analyze the difference in gut microbiota after treatment by the two therapies, this did not affect our affirmation of dual therapy efficacy. Besides, CLA not only causes gastrointestinal reactions, but also prolongs the QT interval and increases the risk of arrhythmia.

In conclusion, a combination of VPZ and a low dose of AMO administration indeed increased the actual cure rate of H. pylori infection, which may be a new breakthrough in improving the actual cure rate of H. pylori. We suggest that dual therapy, especially with a low dose of AMO administration, should be given priority. Although a previous study performed by Ouyang³⁶ has done similar work to ours, the antibiotic resistance of H. pylori was either not reported or limited by geography. However, our study results have the following limitations: (i) the actual cure rate was not more than 90%, which may limit its promotion in western countries and (ii) there was a retrospective study, although it used propensity score matching analysis. All of these limitations would have an effect on the results.

Overall, we suggest a combination of VPZ and low-dose AMO as a prioritized strategy for H. pylori eradication.

Supplemental Material

sj-docx-1-tag-10.1177_17562848221125308 – Supplemental material for Efficacy and safety comparison of Helicobacter pylori eradication between vonoprazan dual therapy versus triple therapy: a systematic review and meta-analysis

Supplemental material, sj-docx-1-tag-10.1177_17562848221125308 for Efficacy and safety comparison of Helicobacter pylori eradication between vonoprazan dual therapy versus triple therapy: a systematic review and meta-analysis by Zheyu Wang and Fen Wang in Therapeutic Advances in Gastroenterology

Footnotes

Acknowledgements

None.

Declarations

ORCID iD

Fen Wang

Supplemental material

Supplemental material for this article is available online.

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