Familial factors in peptic ulcer. I. The occurrence of ulcer in relatives.
D000328:Adult; D000368:Aged; D004381:Duodenal Ulcer / Q000453:epidemiology / Q000235:genetics; D005163:Factor Analysis, Statistical; D005260:Female; D006801:Humans; D008297:Male; D008404:Massachusetts; D008722:Methods; D008875:Middle Aged; D010437:Peptic Ulcer / Q000453:epidemiology / Q000209:etiology / Q000235:genetics*; D010820:Physicians; D013276:Stomach Ulcer / Q000453:epidemiology / Q000235:genetics