C.N.S. malformations in South Wales.
D000757:Anencephaly / Q000453:epidemiology; D002490:Central Nervous System / Q000002:abnormalities*; D002493:Central Nervous System Diseases / Q000453:epidemiology / Q000209:etiology / Q000235:genetics; D004812:Epidemiologic Methods; D005260:Female; D006801:Humans; D006849:Hydrocephalus / Q000453:epidemiology; D007251:Influenza, Human / Q000150:complications; D011247:Pregnancy; D011248:Pregnancy Complications; D012621:Seasons; D012923:Social Class; D016135:Spinal Dysraphism / Q000453:epidemiology; D011795:Surveys and Questionnaires; D014852:Wales