Shah, S., S. Patel, K. Deliwala, D. Munshi, and T. Chudasama. “The Role of Foetal Assessment by Ultrasound at 11-13+6 Weeks of Gestation”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 12, no. 10, Sept. 2023, pp. 3076-9, doi:10.18203/2320-1770.ijrcog20232950.