title: Spina bifida and anencephaly: A problem in genetic-environmental interaction.
mesh_terms: D000757:Anencephaly / Q000453:epidemiology* / Q000235:genetics; D001722:Birth Order; D004739:England; D005260:Female; D006801:Humans; D008297:Male; D008423:Maternal Age; D012621:Seasons; D012959:Socioeconomic Factors; D016135:Spinal Dysraphism / Q000453:epidemiology* / Q000235:genetics