title: Genetic factors in the development of duodenal ulcer in childhood.
mesh_terms: D001789:Blood Group Antigens; D002648:Child; D002675:Child, Preschool; D004381:Duodenal Ulcer / Q000097:blood / Q000235:genetics*; D006801:Humans; D008297:Male; D008967:Molecular Biology; D012463:Saliva; D012737:Sex Factors
chemical_list: D001789:Blood Group Antigens