title: Placebos in clinical trials of duodenal ulcer: the end of an era?
mesh_terms: D000863:Antacids / Q000627:therapeutic use; D002927:Cimetidine / Q000627:therapeutic use; D002986:Clinical Trials as Topic / Q000379:methods*; D004381:Duodenal Ulcer / Q000188:drug therapy*; D004992:Ethics, Medical; D006801:Humans; D010919:Placebos
chemical_list: D000863:Antacids; D010919:Placebos; D002927:Cimetidine