title: Letter: Neural-tube defects and subfertility.
mesh_terms: D000328:Adult; D000757:Anencephaly / Q000453:epidemiology*; D005260:Female; D006065:Gonadotropins, Pituitary / Q000378:metabolism; D006801:Humans; D007247:Infertility, Female; D008423:Maternal Age; D011247:Pregnancy; D016135:Spinal Dysraphism / Q000453:epidemiology*; D013997:Time Factors
chemical_list: D006065:Gonadotropins, Pituitary