Hwang, Kyung Lim, et al. “Long-Term Outcomes of Endoscopic Resection for Non-Ampullary Duodenal Epithelial Tumors: A Single-Center Experience”. Turkish Journal of Gastroenterology, vol. 31, no. 1, Jan. 2020, pp. 49-57, doi:10.5152/tjg.2020.19156.