Vitamins to prevent neural tube defects.
D015982:Bias; D002986:Clinical Trials as Topic / Q000592:standards; D005260:Female; D005492:Folic Acid / Q000627:therapeutic use*; D006801:Humans; D009436:Neural Tube Defects / Q000517:prevention & control*; D011247:Pregnancy
D005492:Folic Acid