title: The current status of esophagoscopy, gastroscopy, and duodenoscopy.
mesh_terms: D001706:Biopsy; D004378:Duodenal Diseases / Q000175:diagnosis; D004386:Duodenum; D019723:Endoscopes; D004724:Endoscopy / Q000379:methods; D004935:Esophageal Diseases / Q000175:diagnosis; D020701:Esophagoscopes; D004945:Esophagoscopy / Q000379:methods; D005336:Fiber Optic Technology; D005767:Gastrointestinal Diseases / Q000175:diagnosis; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis; D020699:Gastroscopes; D005773:Gastroscopy / Q000379:methods; D006801:Humans