Intrahepatic bile duct stone treatment combining electrohydraulic lithotripsy and peroral cholangioscopy through a choledochoduodenal fistula - Yamamoto, Ryuichi; Abe, Toshiyuki; Hosaka, Shosuke; Akase, Takayoshi; Ito, Ayasa; Kawayama, Mikio; Watanabe, Kazunao (Endoscopy, 2019)