Neural tube defects: prevention by vitamin supplements.
D001361:Avitaminosis; D005260:Female; D006801:Humans; D009436:Neural Tube Defects / Q000209:etiology / Q000517:prevention & control*; D011247:Pregnancy; D011248:Pregnancy Complications; D012923:Social Class; D014815:Vitamins / Q000627:therapeutic use*
D014815:Vitamins