Di Mitri, Roberto, and Filippo Mocciaro. “Single-Operator Holmium Laser Lithotripsy under Direct Peroral Cholangioscopy Using an Ultra-Slim Upper Endoscope in a Patient With a Large Stone in the Common Bile Duct”. Turkish Journal of Gastroenterology, vol. 28, no. 6, Jan. 2017, pp. 505-9, doi:10.5152/tjg.2017.17111.