[Concepts, definition and management of intractable ulcer].
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D002648:Child; D004381:Duodenal Ulcer / Q000188:drug therapy; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D010437:Peptic Ulcer / Q000628:therapy*; D010439:Peptic Ulcer Perforation / Q000209:etiology; D011379:Prognosis; D012008:Recurrence; D012907:Smoking; D013276:Stomach Ulcer / Q000150:complications / Q000188:drug therapy