Fetal sex prediction: the heart of the matter.
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D005260:Female; D005333:Fetus / Q000033:anatomy & histology*; D006340:Heart Rate, Fetal; D006801:Humans; D008297:Male; D011247:Pregnancy; D011446:Prospective Studies; D012680:Sensitivity and Specificity; D012732:Sex Determination Analysis / Q000379:methods*; D016216:Ultrasonography, Prenatal