Editorial: Upper gastrointestinal endoscopy.
D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D004064:Digestive System; D005260:Female; D005767:Gastrointestinal Diseases / Q000175:diagnosis / Q000601:surgery; D005773:Gastroscopy; D006801:Humans; D008297:Male; D008875:Middle Aged