| Words | Cluster label |
| Duodenal ulcer, obesity, functional dyspepsia, proton pump inhibitor, peptic ulcer disease, risk factor, prevalence, dyspepsia, Helicobacter-pylori infection | Endoscopy | Peptic ulcer, epidemiology, endoscopy, pepsinogen, chronic gastritis, immunohistochemistry, stomach neoplasms, prognosis, apoptosis, atrophic gastritis, polymorphism, meta-analysis, intestinal metaplasia | Endoscopy | CagA, gastritis, H. pylori, PCR, VacA | H. pylori | Antibiotics, eradication, therapy, levofloxacin, proton pump inhibitors, resistance, treatment, amoxicillin, metronidazole, urease, clarithromycin, children, antibiotic resistance | Helicobacter pylori | Bacteria, microbiome, microbiota, gut microbiota, probiotics, cancer, infection, helicobacter, stomach, inflammation | Inflammation |
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