Causation of neural tube defects: clues from epidemiology.
D000022:Abortion, Spontaneous; D000757:Anencephaly / Q000453:epidemiology* / Q000209:etiology / Q000235:genetics; D003430:Cross-Sectional Studies; D004200:Diseases in Twins; D005061:Europe, Eastern; D005260:Female; D006801:Humans; D007564:Japan; D008297:Male; D008423:Maternal Age; D010298:Parity; D010375:Pedigree; D011247:Pregnancy; D012621:Seasons; D012737:Sex Factors; D012959:Socioeconomic Factors; D016135:Spinal Dysraphism / Q000453:epidemiology* / Q000209:etiology / Q000235:genetics; D013997:Time Factors; D006113:United Kingdom; D014481:United States