Gupta, T., P. Sharma, S. Arora, and D. Baruhee. “Comparative Study of SFlt-1/Plgf Ratio With Uterine Artery Doppler Indices in Prediction of Preeclampsia at 22-24 Weeks Period of Gestation”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 9, no. 3, Feb. 2020, pp. 906-10, doi:10.18203/2320-1770.ijrcog20200492.