Prasad, N. N., S. A. Thampan, and R. Nagarathnamma. “Emergency Cervical Cerclage and Pregnancy Outcomes”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 6, no. 5, Apr. 2017, pp. 1993-8, doi:10.18203/2320-1770.ijrcog20171964.