Singla, Sunaina, and Banashree Das. 2020. “Risk Factor and Perinatal Outcome of Preterm Delivery in a Tertiary Care Centre in Rural Haryana”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology 9 (10):4187-91. https://doi.org/10.18203/2320-1770.ijrcog20204311.