Aya Mohammed Mahros, et al. “Narrow Band Imaging As a Noninvasive Tool for Evaluation of the Severity of Inflammation in Patients With Ulcerative Colitis in Kafr-El-Sheikh University, Egypt”. Journal of the Pakistan Medical Association, vol. 73, no. 4, May 2023, pp. S72-S77, doi:10.47391/JPMA.EGY-S4-16.