Hacer Şebnem Türk, Meltem Aydoğmuş, Oya Ünsal, Canan Tülay Işıl, Bülent Citgez, Sibel Oba, and Mehmet Eren Açık. 2019. “Ketamine Versus Alfentanil Combined With Propofol for Sedation in Colonoscopy Procedures: A Randomized Prospective Study”. Turkish Journal of Gastroenterology 25 (6):644-49. https://tjg.avesjournals.com/index.php/tjg/article/view/3052.