title: No association between age at menarche and sex of offspring.
authors: Frank
authors: F
authors: Geller
authors: Bjarke
authors: B
authors: Feenstra
authors: Mads
authors: M
authors: Melbye
mesh_terms: D005260:Female; D006801:Humans; D007231:Infant, Newborn; D008297:Male; D008423:Maternal Age; D008572:Menarche; D011247:Pregnancy; D012744:Sex Ratio