Anencephalus and spina bifida.
D000757:Anencephaly / Q000453:epidemiology*; D005006:Ethnicity; D006801:Humans; D007231:Infant, Newborn; D012067:Religion; D012621:Seasons; D012923:Social Class; D016135:Spinal Dysraphism / Q000453:epidemiology*; D006113:United Kingdom; D014481:United States