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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
Observational Study