title: Clinical differentiation of upper gastrointestinal bleeding.
mesh_terms: D000328:Adult; D004381:Duodenal Ulcer / Q000150:complications; D005260:Female; D005753:Gastric Mucosa; D006471:Gastrointestinal Hemorrhage / Q000209:etiology*; D006801:Humans; D008297:Male; D008875:Middle Aged; D013272:Stomach Diseases / Q000150:complications; D013276:Stomach Ulcer / Q000150:complications