[Endoscopic study of the upper gastrointestinal tract].
D004384:Duodenoscopy / Q000009:adverse effects / Q000379:methods / Q000451:nursing*; D005336:Fiber Optic Technology; D005773:Gastroscopy / Q000009:adverse effects / Q000379:methods / Q000451:nursing*; D006801:Humans
Endoskopicheskoe issledovanie verkhnikh otdelov zheludochno-kishechnogo trakta.