Vitamin B12 and anencephaly.
D000757:Anencephaly / Q000209:etiology*; D005260:Female; D005494:Folic Acid Deficiency / Q000150:complications; D006801:Humans; D007231:Infant, Newborn; D011247:Pregnancy; D011248:Pregnancy Complications; D011261:Pregnancy Trimester, First; D014806:Vitamin B 12 Deficiency / Q000150:complications*