The value of investigations of the incidence of peptic ulcer in the families of patients with duodenal ulcer.
D000017:ABO Blood-Group System; D004381:Duodenal Ulcer / Q000097:blood / Q000209:etiology / Q000235:genetics*; D006801:Humans; D010375:Pedigree; D010437:Peptic Ulcer / Q000097:blood / Q000150:complications / Q000453:epidemiology / Q000235:genetics*; D012737:Sex Factors
D000017:ABO Blood-Group System