title: Does ascertainment bias contribute to the reported association of omphalocele and gastroschisis with other birth defects in families but not in individuals?
authors.forename: E B
authors.initials: EB
authors.lastname: Hook
mesh_terms: D000009:Abdominal Muscles / Q000002:abnormalities*; D015982:Bias; D015897:Comorbidity; D000013:Congenital Abnormalities / Q000453:epidemiology*; D005808:Genes, Recessive; D006554:Hernia, Umbilical / Q000453:epidemiology* / Q000235:genetics; D006801:Humans; D007231:Infant, Newborn; D008957:Models, Genetic; D010342:Patient Acceptance of Health Care