Xia, H H Demographic and endoscopic characteristics of patients with Helicobacter pylori positive and negative peptic ulcer disease. [electronic resource] - The Medical journal of Australia Nov 2000 - 515-9 p. digital Publication Type: Comparative Study; Journal Article ISSN: 0025-729X Standard No.: 10.5694/j.1326-5377.2000.tb139318.x doi Subjects--Topical Terms: AdolescentAdultAge DistributionAgedAged, 80 and overAnti-Inflammatory Agents, Non-Steroidal--adverse effectsAustralia--epidemiologyChronic DiseaseCross-Sectional StudiesEndoscopy, GastrointestinalFemaleHelicobacter Infections--epidemiologyHelicobacter pylori--isolation & purificationHumansMaleMiddle AgedOdds RatioPeptic Ulcer--epidemiologyPrevalenceProspective Studies