[Endoscopic study of the stomach and duodenum].
D004378:Duodenal Diseases / Q000175:diagnosis*; D004724:Endoscopy; D005773:Gastroscopy; D006801:Humans; D008722:Methods; D013272:Stomach Diseases / Q000175:diagnosis*
Endoskopicheskoe issledovanie zheludka i dvenadtsatiperstnoĭ kishki.