Siripornadulsilp, Surachai, and Nisit Tongsiri. “Managing Difficult Cannulations in Endoscopic Retrograde Cholangiopancreatography: A Prospective Randomized Control Trial Study of Precut Needle Knife Sphincterotomy versus Transpancreatic Sphincterotomy Technique”. Siriraj Medical Journal 71, no. 3 (May 23, 2019): 175–180. accessed October 10, 2026. https://he02.tci-thaijo.org/index.php/sirirajmedj/article/view/190625.