Duodenoscopy: methods and findings.
D004381:Duodenal Ulcer / Q000175:diagnosis; D004386:Duodenum; D019723:Endoscopes; D004724:Endoscopy; D004935:Esophageal Diseases / Q000175:diagnosis; D004945:Esophagoscopy; D005773:Gastroscopy; D006801:Humans; D008722:Methods; D013272:Stomach Diseases / Q000175:diagnosis