Hamada Yoshihiro, Maeshiro Kensei, and Nakayama Yoshifuku. 2019. “Endoscopic Papillectomy for Carcinoma of the Ampulla of Vater: Possible Standardization Based on Endoscopy and Immunohistochemistry”. Turkish Journal of Gastroenterology 25 (5):563-67. https://turkjgastroenterol.avesjournals.com/index.php/tjg/article/view/3026.