Anencephalus: variation with maternal age, parity, social class and region in England, Scotland and Wales.
D000328:Adult; D000757:Anencephaly / Q000453:epidemiology*; D004739:England; D005260:Female; D006801:Humans; D008423:Maternal Age; D008875:Middle Aged; D010298:Parity; D012606:Scotland; D012923:Social Class; D014852:Wales