The recurrence risk in spina bifida cystica and anencephaly.
D000757:Anencephaly / Q000453:epidemiology / Q000235:genetics; D002490:Central Nervous System / Q000196:embryology; D002869:Chromosome Aberrations; D025063:Chromosome Disorders; D002908:Chronic Disease; D004200:Diseases in Twins; D004677:Encephalocele / Q000453:epidemiology / Q000235:genetics; D004739:England; D005260:Female; D006801:Humans; D006849:Hydrocephalus / Q000453:epidemiology; D007231:Infant, Newborn; D008297:Male; D016135:Spinal Dysraphism / Q000209:etiology / Q000235:genetics* / Q000601:surgery; D014852:Wales