Emergency endoscopy in upper gastrointestinal bleeding.
D000293:Adolescent; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D004724:Endoscopy; D005260:Female; D005767:Gastrointestinal Diseases / Q000150:complications / Q000175:diagnosis*; D006471:Gastrointestinal Hemorrhage / Q000209:etiology*; D006801:Humans; D008297:Male; D008875:Middle Aged