Factors associated with anencephalus and spina bifida in Belfast.
D000757:Anencephaly / Q000150:complications / Q000453:epidemiology*; D004739:England; D005260:Female; D005313:Fetal Death / Q000453:epidemiology; D006306:Health Surveys; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D009660:Northern Ireland; D011247:Pregnancy; D012606:Scotland; D012621:Seasons; D012737:Sex Factors; D012923:Social Class; D016135:Spinal Dysraphism / Q000150:complications / Q000453:epidemiology*