“Salvage techniques” are the key to overcome difficult biliary cannulation in endoscopic retrograde cholangiopancreatography by Shikiko Maruta, Harutoshi Sugiyama, Sadahisa Ogasawara, Chihei Sugihara, Mayu Ouchi, Motoyasu Kan, Toshihito Yamada, Yoshifumi Miura, Hiroki Nagashima, Koji Takahashi, Yuko Kusakabe, Hiroshi Ohyama, Koichiro Okitsu, Izumi Ohno, Rintaro Mikata, Yuji Sakai, Toshio Tsuyuguchi, Jun Kato, Naoya Kato

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