Letter: Congenital-malformation rates and spontaneous-abortion rates.
D000022:Abortion, Spontaneous / Q000453:epidemiology*; D000757:Anencephaly / Q000453:epidemiology*; D005260:Female; D006801:Humans; D011247:Pregnancy; D016135:Spinal Dysraphism / Q000453:epidemiology*; D014852:Wales