Novel sphincterotomy device that orientates blade along the axis of the bile duct in patients with Roux-en-Y anastomosis - Takenaka, Mamoru; Yoshikawa, Tomoe; Okamoto, Ayana; Nakai, Atsushi; Minaga, Kosuke; Yamao, Kentaro; Kudo, Masatoshi (Endoscopy, 2019)