Çam, Hakan, Seda Pehlivan, Muhammed Sait Dağ, Nimet Yılmaz, Umut Demir, and Murat Taner Gülşen. 2016. “Study of Ideal Topical Pharyngeal Anesthesia in Upper Gastrointestinal System Endoscopy: A Double-Blind, Randomized, Controlled Trial”. Turkish Journal of Gastroenterology 27 (2):103-7. https://doi.org/10.5152/tjg.2015.150322.