K. L. Hwang, G. H. Kim, B. E. Lee, M. W. Lee, D. H. Baek, and G. A. Song, “Long-term outcomes of endoscopic resection for non-ampullary duodenal epithelial tumors: A single-center experience”, Turkish Journal of Gastroenterology, vol. 31, no. 1, pp. 49–57, Jan. 2020.