The enigma of upper gastrointestinal hemorrhage.
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D004381:Duodenal Ulcer / Q000175:diagnosis; D005260:Female; D005756:Gastritis / Q000150:complications / Q000175:diagnosis; D006471:Gastrointestinal Hemorrhage / Q000209:etiology* / Q000401:mortality; D006396:Hematemesis / Q000209:etiology; D006801:Humans; D008297:Male; D008551:Melena / Q000209:etiology; D008875:Middle Aged; D010437:Peptic Ulcer / Q000150:complications; D010438:Peptic Ulcer Hemorrhage; D012189:Retrospective Studies; D012737:Sex Factors; D013276:Stomach Ulcer / Q000175:diagnosis