Inconstancy of human sex ratios at birth.
James
William H
WH
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