Anencephalus in Belfast. Incidence and secular and seasonal variations, 1950-66.
D000757:Anencephaly / Q000453:epidemiology*; D001722:Birth Order; D004739:England; D005260:Female; D005313:Fetal Death; D006801:Humans; D007226:Infant Mortality; D007231:Infant, Newborn; D008297:Male; D009660:Northern Ireland; D010298:Parity; D011247:Pregnancy; D012606:Scotland; D012621:Seasons; D012737:Sex Factors; D012923:Social Class; D013997:Time Factors; D014852:Wales