Sarkate, P. S., and S. Hiwale. “Relationship of Umbilical Coiling Index and Cord Twist Direction With Adverse Perinatal Outcomes”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 8, no. 9, Aug. 2019, pp. 3782-8, doi:10.18203/2320-1770.ijrcog20193815.