Gastrointestinal endoscopy.
D000059:Accidents; D001659:Biliary Tract / Q000473:pathology; D001706:Biopsy; D003106:Colon / Q000473:pathology; D004386:Duodenum / Q000473:pathology; D004493:Education; D004724:Endoscopy; D004945:Esophagoscopy; D005336:Fiber Optic Technology; D005756:Gastritis / Q000175:diagnosis; D005767:Gastrointestinal Diseases / Q000175:diagnosis* / Q000473:pathology; D020699:Gastroscopes; D006801:Humans; D010535:Laparoscopy; D008722:Methods; D010437:Peptic Ulcer / Q000175:diagnosis; D010781:Photography; D013274:Stomach Neoplasms / Q000175:diagnosis; D013690:Television