Influence of birth order and maternal age on the human sex ratio at birth.
D001722:Birth Order; D005190:Family; D005260:Female; D005333:Fetus; D006801:Humans; D008423:Maternal Age; D036801:Parturition; D011247:Pregnancy; D012744:Sex Ratio
FAMILY; FETUS; PREGNANCY
Br J Soc Med. 1952 Oct;6(4):265-6
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