Prevention of anencephaly and spina bifida in man.
D000757:Anencephaly / Q000453:epidemiology / Q000209:etiology / Q000517:prevention & control*; D002170:Canada; D005658:Fungi; D006801:Humans; D010935:Plant Diseases; D012621:Seasons; D016135:Spinal Dysraphism / Q000453:epidemiology / Q000209:etiology / Q000517:prevention & control*; D014481:United States; D014675:Vegetables / Q000009:adverse effects