Multiple cases of duodenal ulcer in one family.
D000017:ABO Blood-Group System; D000293:Adolescent; D000328:Adult; D004381:Duodenal Ulcer / Q000175:diagnosis / Q000235:genetics*; D005260:Female; D005745:Gastric Acidity Determination; D005750:Gastric Juice; D006385:Hemagglutination Inhibition Tests; D006801:Humans; D008297:Male; D012463:Saliva
D000017:ABO Blood-Group System