title: Tribulations of a clinical trial.
mesh_terms: D000863:Antacids / Q000627:therapeutic use; D002927:Cimetidine / Q000627:therapeutic use; D002986:Clinical Trials as Topic / Q000379:methods*; D004724:Endoscopy; D006471:Gastrointestinal Hemorrhage / Q000517:prevention & control; D006801:Humans; D009864:Ontario
chemical_list: D000863:Antacids; D002927:Cimetidine