Efficacy of mapping biopsy using a novel sheath system for the histological diagnosis of superficial ductal spread in distal cholangiocarcinoma: A retrospective multicenter study

Mitsuru Okuno*, Keisuke Iwata, Tsuyoshi Mukai, Takuji Iwashita, Takuji Tanaka, Akinori Maruta, Keisuke Kawashima, Ichiro Yasuda, Hisataka Moriwaki, Masahito Shimizu

*Corresponding author for this work

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Medicine and Dentistry

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