Letter: Subfertility and anencephaly.
D000757:Anencephaly / Q000209:etiology* / Q000235:genetics; D004200:Diseases in Twins / Q000209:etiology; D005260:Female; D005298:Fertility; D006801:Humans; D008431:Maternal-Fetal Exchange; D011247:Pregnancy; D016135:Spinal Dysraphism / Q000209:etiology* / Q000235:genetics