Stent-in-stent deployment across the papilla for malignant hilar biliary obstruction using novel slim multi-hole metal stents - Maruyama, Hirotsugu; Ishikawa-Kakiya, Yuki; Kawata, Yuji; Kurokawa, Tatsuya; Shimamoto, Yoshinori; Tanoue, Kojiro; Fujiwara, Yasuhiro (Endoscopy International Open, 2025)