Jamal, S. and Srivastava, R. 2017. A retrospective analytical study of the epidemiology and causes of preterm birth. International Journal of Reproduction, Contraception, Obstetrics and Gynecology. 6, 12 (Nov. 2017), 5453–5457. DOI:https://doi.org/10.18203/2320-1770.ijrcog20175259.