Vanamala, V.G., Pakyanadhan, S., Rachel, A. and P., S.A. 2018. Pelvic inflammatory disease and the risk factors. International Journal of Reproduction, Contraception, Obstetrics and Gynecology. 7, 9 (Aug. 2018), 3572–3575. DOI:https://doi.org/10.18203/2320-1770.ijrcog20183373.