Uncontrolled factors in controlled trials of peptic ulcer.
D000897:Anti-Ulcer Agents / Q000627:therapeutic use*; D002986:Clinical Trials as Topic / Q000379:methods*; D004311:Double-Blind Method; D006801:Humans; D010361:Patients / Q000523:psychology; D010437:Peptic Ulcer / Q000188:drug therapy; D010817:Physician-Patient Relations; D010919:Placebos; D012107:Research Design
D000897:Anti-Ulcer Agents; D010919:Placebos