Türk, Hacer Şebnem, Meltem Aydoğmuş, Oya Ünsal, Canan Tülay Işıl, Bülent Citgez, Sibel Oba, and Mehmet Eren Açık. “Ketamine Versus Alfentanil Combined With Propofol for Sedation in Colonoscopy Procedures: A Randomized Prospective Study”. Turkish Journal of Gastroenterology 25, no. 6 (January 6, 2014): 644–649. Accessed January 1, 2026. https://www.turkjgastroenterol.org/index.php/tjg/article/view/2643.