Muhammad Musharaf Baig , Muhammad Ajmal ,Ifra Saeed , Syeda Fatima. “Prevalence of Cholesteatoma and Its Complications in Patients of Chronic Suppurative Otitis Media”. Journal of Rawalpindi Medical College, vol. 15, no. 1, June 2011, http://journalrmc.com/index.php/JRMC/article/view/640.