Role of Helicobacter pylori in duodenal ulcer.
D000208:Acute Disease; D004381:Duodenal Ulcer / Q000453:epidemiology / Q000382:microbiology*; D004382:Duodenitis / Q000382:microbiology; D005756:Gastritis / Q000382:microbiology; D016481:Helicobacter Infections / Q000150:complications* / Q000453:epidemiology; D016480:Helicobacter pylori; D006801:Humans