Utility of a novel tapered-tip sheath system for preoperative mapping biopsy of biliary tract cancers by Tomoaki Matsumori, Norimitsu Uza, Kazuhiro Okada, Masahiro Shiokawa, Takahisa Maruno, Yoshihiro Nishikawa, Takeshi Kuwada, Yuya Muramoto, Muneji Yasuda, Hajime Yamazaki, Kojiro Taura, Etsuro Hatano, Yuzo Kodama, Hiroshi Seno

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