[Invention of esophagogastroduodenoscopy in XIX--beginning of XX century].
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Balalykin
D016145:Endoscopy, Digestive System / Q000266:history; D020701:Esophagoscopes / Q000266:history; D004945:Esophagoscopy / Q000266:history*; D020699:Gastroscopes / Q000266:history; D005773:Gastroscopy / Q000266:history*; D049672:History, 19th Century; D049673:History, 20th Century; D006801:Humans