Hakim, Abdul, et al. “COMPARISON OF COMBINED ORAL & TOPICAL VERSUS TOPICAL CORTICOSTEROIDS AFTER FUNCTIONAL ENDOSCOPIC SINUS SURGERY OF NASAL POLYPOSIS”. Pakistan Armed Forces Medical Journal, vol. 67, no. Suppl-3, Aug. 2017, pp. S304-07, https://mail.pafmj.org/index.php/PAFMJ/article/view/4580.