title: Variations of the human sex ratio at birth.
authors.forename: W H
authors.initials: WH
authors.lastname: James
mesh_terms: D003075:Coitus / Q000502:physiology; D005260:Female; D006801:Humans; D007315:Insemination, Artificial; D008297:Male; D010060:Ovulation / Q000502:physiology; D011247:Pregnancy; D012744:Sex Ratio