Johncy, A., G. Rohini, and L. Shri. “NT Scan: Can It Prevent Second Trimester MTP Complications?”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 7, no. 6, May 2018, pp. 2497-9, doi:10.18203/2320-1770.ijrcog20182375.