“Prediction of Hypertensive Disorders in Pregnancy by Estimation of Maternal Serum Beta HCG Levels in the Mid-Trimester (13-20 Weeks) of Pregnancy”. International Journal of Biomedical Research 9, no. 10 (October 28, 2018): 354–357. Accessed February 16, 2026. https://ssjournals.co.in/index.php/ijbr/article/view/4903.