Folic acid deficiency and congenital malformation.
D000013:Congenital Abnormalities / Q000209:etiology*; D005260:Female; D005492:Folic Acid / Q000097:blood; D005494:Folic Acid Deficiency / Q000150:complications*; D006801:Humans; D011247:Pregnancy; D011248:Pregnancy Complications; D011446:Prospective Studies
D005492:Folic Acid