title: Inconstancy of human sex ratios at birth.
authors.forename: William H
authors.initials: WH
authors.lastname: James
mesh_terms: D015982:Bias; D015986:Confounding Factors, Epidemiologic; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D008962:Models, Theoretical; D036801:Parturition / Q000502:physiology; D012744:Sex Ratio