Variation in the human sex ratio at birth with maternal age, parity and placental pathology.
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D005260:Female; D006801:Humans; D007743:Labor, Obstetric; D008297:Male; D008423:Maternal Age; D010298:Parity; D010922:Placenta Diseases / Q000503:physiopathology*; D011247:Pregnancy; D012744:Sex Ratio