[Endoscopy of the duodenum by fiberscope and its application].
D014670:Ampulla of Vater; D001660:Biliary Tract Diseases / Q000175:diagnosis; D004378:Duodenal Diseases / Q000175:diagnosis*; D004381:Duodenal Ulcer / Q000175:diagnosis; D004724:Endoscopy; D005336:Fiber Optic Technology; D006801:Humans