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Retrospective Study
Fu-Hai Ma, Li-Yan Xue, Ying-Tai Chen, Wei-Kun Li, Yang Li, Wen-Zhe Kang, Yi-Bin Xie, Yu-Xin Zhong, Quan Xu, Yan-Tao Tian 
World J Gastrointest Oncol 11(5):416-423. Published online May 15, 2019. doi: 10.4251/wjgo.v11.i5.416
Observational Study
Hiroaki Takaya, Tadashi Namisaki, Naotaka Shimozato, Kosuke Kaji, Mitsuteru Kitade, Kei Moriya, Shinya Sato, Hideto Kawaratani, Takemi Akahane, Masanori Matsumoto, Hitoshi Yoshiji 
World J Gastrointest Oncol 11(5):424-435. Published online May 15, 2019. doi: 10.4251/wjgo.v11.i5.424