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Retrospective Cohort Study
Yuki Miyasako, Toshio Kuwai, Sauid Ishaq, Kanae Tao, Hirona Konishi, Ryoichi Miura, Yuki Sumida, Kazutaka Kuroki, Yuzuru Tamaru, Ryusaku Kusunoki, Atsushi Yamaguchi, Hirotaka Kouno, Hiroshi Kohno 
World J Gastrointest Surg 12(4):138-148. Published online Apr 27, 2020. doi: 10.4240/wjgs.v12.i4.138
Retrospective Study
Steven D Scoville, Dimitrios Xourafas, Aslam M Ejaz, Allan Tsung, Timothy Pawlik, Jordan M Cloyd 
World J Gastrointest Surg 12(4):159-170. Published online Apr 27, 2020. doi: 10.4240/wjgs.v12.i4.159
Lian-Song Ye, Yan Li, Wei Liu, Ming-Hong Yao, Naveed Khan, Bing Hu 
World J Gastrointest Surg 12(4):171-177. Published online Apr 27, 2020. doi: 10.4240/wjgs.v12.i4.171
Observational Study
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