The clinical usefulness of fiberoptic esophago-gastroscopy.
D020701:Esophagoscopes; D004945:Esophagoscopy; D005336:Fiber Optic Technology; D005767:Gastrointestinal Diseases / Q000175:diagnosis; D020699:Gastroscopes; D005773:Gastroscopy; D006801:Humans; D008722:Methods