Pratap, Charu, and Srishti Thakur. 2018. “Prediction of Pre-Eclampsia in Early Pregnancy Using PAPP-A and Uterine Artery Pulsatility Index”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology 7 (12):5005-10. https://doi.org/10.18203/2320-1770.ijrcog20184956.