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*Department of Surgery and †Brain Korea 21 Project for Medical Science, Yonsei University Health System, Seoul, Korea ‡Robot and MIS center, Severance Hospital, Yonsei University Health System, Seoul, Korea §Department of Surgical Oncology, Gifu University School of Medicine, Gifu, Japan ¶Department of General Surgery, Nanfang Hospital, Southern Medical University, Guangzhou, P. R. China.