Meral AKDOĞAN, et al. “Insertion of Overtube With the Aid of Esophageal Bougie Dilator: A Convenient Method”. Turkish Journal of Gastroenterology, vol. 12, no. 3, July 2019, pp. 203-5, https://tjg.avesjournals.com/index.php/tjg/article/view/1734.