BAYSAL, Çağlar, Ülkü DAĞLI, Ahmet TEZEL, Azmi SERİN, and Aysel ÜLKER. “Interobserver Variation of Endoscopic Activity Index in Ulcerative Colitis”. Turkish Journal of Gastroenterology 8, no. 2 (January 2, 1997): 232–236. Accessed January 1, 2026. https://www.turkjgastroenterol.org/index.php/tjg/article/view/790.