Anencephalus, spina bifida, and hydrocephalus incidence related to sex, race, and season of birth, and incidence in siblings.
D009008:Abnormalities, Severe Teratoid; D000757:Anencephaly; D000013:Congenital Abnormalities / Q000706:statistics & numerical data*; D005260:Female; D006801:Humans; D006849:Hydrocephalus; D015994:Incidence; D036801:Parturition; D012621:Seasons; D035781:Siblings; D016135:Spinal Dysraphism
ABNORMALITIES/statistics; HYDROCEPHALUS; MONSTERS; SPINA BIFIDA