title: Periconceptual parental smoking and sex ratio of offspring.
authors.forename: William H
authors.initials: WH
authors.lastname: James
mesh_terms: D005260:Female; D005306:Fertilization; D006801:Humans; D008297:Male; D018811:Maternal Exposure; D018812:Paternal Exposure; D012744:Sex Ratio; D012907:Smoking