Usefulness of the artificial intelligence-mediated virtual chromoendoscopy in peroral cholangioscopy - Sato, Ryosuke; Matsumoto, Kazuyuki; Kinugasa, Hideaki; Uchida, Daisuke; Horiguchi, Shigeru; Kato, Hironari; Otsuka, Motoyuki (Endoscopy, 2023)