[Melena].
D001803:Blood Transfusion; D004381:Duodenal Ulcer / Q000150:complications; D005243:Feces; D005392:First Aid; D006471:Gastrointestinal Hemorrhage / Q000150:complications*; D006487:Hemostasis; D006801:Humans; D008297:Male; D008551:Melena / Q000209:etiology / Q000628:therapy*; D008875:Middle Aged; D010437:Peptic Ulcer / Q000150:complications; D013274:Stomach Neoplasms / Q000150:complications