Efficacy of short-bending sphincterotome for difficult biliary cannulation in double-balloon enteroscopy-assisted ERCP - Kitagawa, Koh; Mitoro, Akira; Tomooka, Fumimasa; Asada, Shohei; Fujinaga, Yukihisa; Nishimura, Norihisa; Yoshiji, Hitoshi (Endoscopy, 2023)