Cimetidine versus ranitidine.
D000428:Alcohol Drinking; D002927:Cimetidine / Q000627:therapeutic use*; D004381:Duodenal Ulcer / Q000188:drug therapy*; D004384:Duodenoscopy; D006801:Humans; D010349:Patient Compliance; D011899:Ranitidine / Q000627:therapeutic use*; D012008:Recurrence; D012107:Research Design
D002927:Cimetidine; D011899:Ranitidine