The association of place of birth in South Wales with central nervous system malformation prevalence.
D002490:Central Nervous System / Q000002:abnormalities*; D000013:Congenital Abnormalities / Q000453:epidemiology*; D004812:Epidemiologic Methods; D006801:Humans; D007231:Infant, Newborn; D012923:Social Class; D014852:Wales