title: The natural history of duodenal ulceration.
mesh_terms: D001241:Aspirin / Q000009:adverse effects; D004381:Duodenal Ulcer / Q000000981:diagnostic imaging / Q000209:etiology / Q000401:mortality / Q000628:therapy*; D005260:Female; D005745:Gastric Acidity Determination; D005750:Gastric Juice / Q000032:analysis; D006471:Gastrointestinal Hemorrhage / Q000139:chemically induced; D006801:Humans; D008297:Male; D010438:Peptic Ulcer Hemorrhage / Q000628:therapy; D010817:Physician-Patient Relations; D011859:Radiography; D012008:Recurrence
chemical_list: D001241:Aspirin