Asghar, Dr. Fareeha, et al. “RELATIONSHIP BETWEEN PELVIC INFLAMMATORY DISEASE AND INTRAUTERINE CONTRACEPTIVE DEVICE; A CASE CONTROL STUDY FROM PAKISTAN”. Pakistan Armed Forces Medical Journal, vol. 69, no. SUPPL 2, May 2019, pp. S254-58, https://pafmj.org/PAFMJ/article/view/2887.