First‐trimester determination of fetal gender by ultrasound

@article{Efrat1999FirsttrimesterDO,
  title={First‐trimester determination of fetal gender by ultrasound},
  author={Zeev Efrat and Olayinka Akinfenwa and Kypros H. Nicolaides},
  journal={Ultrasound in Obstetrics and Gynecology},
  year={1999},
  volume={13}
}
To assess the accuracy of fetal sex determination at 11–14 weeks of gestation. 
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