title: Variation of sex ratio within very large sibships.
authors.forename: W H
authors.initials: WH
authors.lastname: James
mesh_terms: D001722:Birth Order; D003627:Data Interpretation, Statistical; D005190:Family; D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D008423:Maternal Age; D010331:Paternal Age; D012744:Sex Ratio