title: A century of upper gastrointestinal tract endoscopy.
mesh_terms: D001317:Austria; D001706:Biopsy; D004386:Duodenum; D004560:Electricity / Q000266:history; D004724:Endoscopy / Q000266:history*; D004945:Esophagoscopy / Q000266:history; D005336:Fiber Optic Technology; D005767:Gastrointestinal Diseases / Q000175:diagnosis*; D020699:Gastroscopes; D005773:Gastroscopy / Q000266:history; D049672:History, 19th Century; D049673:History, 20th Century; D007564:Japan; D008029:Lighting; D010781:Photography; D013272:Stomach Diseases / Q000175:diagnosis; D014481:United States