Ahuja, Rashmi, Anupa Sood, Anita Pal, and Rita Mittal. 2017. “Role of Micronized Progesterone in Prevention of Preterm Labour in Women With Previous History of One or More Preterm Births: a Research Study at a Tertiary Care Hospital”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology 4 (4):1176-80. https://doi.org/10.18203/2320-1770.ijrcog20150450.