Successful removal of an uncovered metallic stent using peroral direct cholangioscopy and the stent-in-stent technique - Matsumi, Akihiro; Matsumoto, Kazuyuki; Yamazaki, Tatsuhiro; Horiguchi, Shigeru; Tsutsumi, Koichiro; Kato, Hironari; Okada, Hiroyuki (Endoscopy, 2022)