Yadav, K., Ojha, P., & Chopra, A. (2021). Comparison of maternal serum CA-125 and ultrasonography findings as a prognostic marker in threatened abortion. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, 10(6), 2253–2258. https://doi.org/10.18203/2320-1770.ijrcog20212157