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Retrospective Study
Ren Togo, Kenta Ishihara, Katsuhiro Mabe, Harufumi Oizumi, Takahiro Ogawa, Mototsugu Kato, Naoya Sakamoto, Shigemi Nakajima, Masahiro Asaka, Miki Haseyama 
World J Gastrointest Oncol 10(2):62-70. Published online Feb 15, 2018. doi: 10.4251/wjgo.v10.i2.62