title: Major central nervous system malformations notified in Northern Ireland 1964-1968.
mesh_terms: D000757:Anencephaly / Q000453:epidemiology*; D005260:Female; D006801:Humans; D006849:Hydrocephalus / Q000453:epidemiology*; D007231:Infant, Newborn; D008297:Male; D009660:Northern Ireland; D012621:Seasons; D012737:Sex Factors; D016135:Spinal Dysraphism / Q000453:epidemiology*; D014505:Urban Population