Garg, S., Kaur, T., Saran, A. S., & Yadav, M. (2017). A study of etiology and outcome of preterm birth at a tertiary care centre. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, 6(10), 4488–4491. https://doi.org/10.18203/2320-1770.ijrcog20174429