Four-Step Classification of Endoscopic Transpapillary Gallbladder Drainage and the Practical Efficacy of Cholangioscopic Assistance by Michihiro Yoshida, Itaru Naitoh, Kazuki Hayashi, Naruomi Jinno, Yasuki Hori, Makoto Natsume, Akihisa Kato, Kenta Kachi, Go Asano, Naoki Atsuta, Hidenori Sahashi, Hiromi Kataoka

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