title: Endoscopy in upper gastrointestinal bleeding then and now. Changing concepts of bleeding sources.
mesh_terms: D000293:Adolescent; D000328:Adult; D000368:Aged; D002648:Child; D004381:Duodenal Ulcer / Q000175:diagnosis; D019723:Endoscopes; D005260:Female; D005767:Gastrointestinal Diseases / Q000175:diagnosis; D006471:Gastrointestinal Hemorrhage / Q000175:diagnosis* / Q000209:etiology; D006801:Humans; D008297:Male; D008875:Middle Aged; D013997:Time Factors