Successful cold polypectomy for ectopic endometriosis in a narrow distal bile duct using a new slim cholangioscope - Maruyama, Hirotsugu; Ishikawa-Kakiya, Yuki; Kawata, Yuji; Kurokawa, Tatsuya; Shimamoto, Yoshinori; Tanoue, Kojiro; Fujiwara, Yasuhiro (Endoscopy, 2025)