Upper gastrointestinal endoscopy: update 1986.
D001660:Biliary Tract Diseases / Q000175:diagnosis / Q000628:therapy; D004724:Endoscopy; D004932:Esophageal and Gastric Varices / Q000175:diagnosis / Q000628:therapy; D004945:Esophagoscopy; D005767:Gastrointestinal Diseases / Q000175:diagnosis*; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis; D005773:Gastroscopy; D006801:Humans; D012306:Risk