title: Genealogical investigation in a group of children with duodenal ulcer.
mesh_terms: D000293:Adolescent; D000367:Age Factors; D002648:Child; D004381:Duodenal Ulcer / Q000235:genetics*; D005260:Female; D006801:Humans; D008297:Male; D010375:Pedigree; D012737:Sex Factors