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Ryo Tanabe
Department of Surgery, Watanabe Hospital, Okayama, Japan Center for Graduate Medical Education, Okayama University Hospital, Okayama, Japan
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Hiroki Matsuura
Department of General Internal Medicine, Okayama City Hospital, Okayama, Japan
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Yuki Otsuka
Center for Graduate Medical Education, Okayama University Hospital, Okayama, Japan
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Akira Endo
Department of Surgery, Watanabe Hospital, Okayama, Japan