Yuqi He, Xin Wang, Yongqiang Du, Victoria Yee-Wa Yung, Peng Jin, and Jianqiu Sheng, “Predictive factors for technically difficult endoscopic submucosal dissection in large colorectal tumors”, Turkish Journal of Gastroenterology, vol. 27, no. 6, pp. 541–546, Jul. 2019.