Chung HH, Park JK, Lee KH, Lee JK, Lee KT. The rate of endoscopic observation of the major duodenal papilla can be increased by simple guideline. Int J Adv Med [Internet]. 2022 Feb. 23 [cited 2025 Apr. 30];9(3):266-72. Available from: https://www.ijmedicine.com/index.php/ijam/article/view/3369