title: Neural tube defects and sex ratios.
authors.forename: M J
authors.initials: MJ
authors.lastname: Seller
mesh_terms: D005260:Female; D006801:Humans; D008297:Male; D009436:Neural Tube Defects / Q000453:epidemiology*; D012737:Sex Factors; D016136:Spina Bifida Occulta / Q000453:epidemiology