A novel slim cholangioscope facilitates antegrade laser lithotripsy for an intrahepatic biliary stone with acute ductal angulation - Miwa, Haruo; Tsunoda, Shotaro; Endo, Kazuki; Oishi, Ritsuko; Suzuki, Yuichi; Tsuchiya, Hiromi; Maeda, Shin (Endoscopy, 2025)