title: Evidence-based medicine.
authors.forename: L S
authors.initials: LS
authors.lastname: Chagla
authors.forename: P G
authors.initials: PG
authors.lastname: McCulloch
mesh_terms: D000208:Acute Disease; D001803:Blood Transfusion; D015510:Clinical Medicine; D006471:Gastrointestinal Hemorrhage / Q000188:drug therapy / Q000628:therapy; D006801:Humans; D016032:Randomized Controlled Trials as Topic; D011899:Ranitidine / Q000627:therapeutic use
chemical_list: D011899:Ranitidine