Chowdhary, H., R. Khurshid, S. Parveen, S. Yousuf, S. H. Tali, and Z. A. Shah. “Utility of Second Trimester Beta HCG Levels in Prediction of Gestational Hypertension: A Prospective Cohort Study”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 6, no. 3, Feb. 2017, pp. 1040-4, doi:10.18203/2320-1770.ijrcog20170581.