title: Helicobacter pylori and duodenal ulcer.
authors.forename: P J
authors.initials: PJ
authors.lastname: Prichard
authors.forename: N D
authors.initials: ND
authors.lastname: Yeomans
mesh_terms: D015984:Causality; D004381:Duodenal Ulcer / Q000453:epidemiology / Q000382:microbiology*; D016481:Helicobacter Infections / Q000453:epidemiology*; D016480:Helicobacter pylori; D006801:Humans