Seohee Choi1, Hyoung-Il Kim2,3,4. 1. Department of Surgery, Eulji General Hospital, Eulji University College of Medicine, Seoul, South Korea. 2. Department of Surgery, Yonsei University College of Medicine, Seoul, Republic of Korea. cairus@yuhs.ac. 3. Gastric Cancer Center, Yonsei Cancer Center, Yonsei University Health System, Seoul, Republic of Korea. cairus@yuhs.ac. 4. Robot and MIS Center, Severance Hospital, Yonsei University Health System, Seoul, Republic of Korea. cairus@yuhs.ac.