Sex ratio in human embryos obtained from induced abortion: histological examination of the gonad in 1,452 cases.
D000028:Abortion, Induced; D004622:Embryo, Mammalian / Q000033:anatomy & histology*; D005260:Female; D005865:Gestational Age; D006066:Gonads / Q000033:anatomy & histology*; D006801:Humans; D011247:Pregnancy; D012744:Sex Ratio