[Nosological studies on the peptic ulcer].
D000293:Adolescent; D000328:Adult; D000367:Age Factors; D000368:Aged; D002648:Child; D004035:Diet Therapy; D005247:Feeding Behavior; D005260:Female; D006801:Humans; D008297:Male; D008875:Middle Aged; D009790:Occupations; D010437:Peptic Ulcer / Q000453:epidemiology / Q000209:etiology / Q000628:therapy; D011584:Psychology; D012737:Sex Factors