Chholak, Deepika, Pratiksha Gupta, and Santosh Khajotia. 2017. “Study to Evaluate Association of Umbilical Coiling Index and Perinatal Outcome”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology 6 (2):408-12. https://doi.org/10.18203/2320-1770.ijrcog20170025.