Chowdhury, T. S., N. Mahmud, and T. Chowdhury. “Endometriosis: Correlation of Severity of Pain With Stages of Disease”. Journal of Bangladesh College of Physicians and Surgeons, vol. 34, no. 3, Apr. 2017, pp. 135-9, doi:10.3329/jbcps.v34i3.32345.