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1. Department of Surgery, Jikeikai Nishida Hospital, 2-266, Tsuruoka Nishimachi, Saiki-shi, Oita, 876-0047, Japan 2. Oita University Hospital Emergency and Critical Care Center, Oita, Japan 3. Department of Diagnostic Pathology, Faculty of Medicine, Oita University, Oita, Japan 4. Department of Surgery, Center for Community Medicine, Faculty of Medicine, Oita University, Oita, Japan