Sachdeva, P. K., A. Dahiya, and R. Singh. “Incidence of Pelvic Inflammatory Disease in Backache in Females”. International Journal of Reproduction, Contraception, Obstetrics and Gynecology, vol. 5, no. 10, Dec. 2016, pp. 3322-5, doi:10.18203/2320-1770.ijrcog20163178.