Kyoung Hoon Lim1, Jinyoung Park2. 1. Department of Surgery, Trauma Center, Kyungpook National University Hospital, School of Medicine, Kyungpook National University, Daegu, South Korea. 2. Department of Surgery, Trauma Center, Kyungpook National University Hospital, School of Medicine, Kyungpook National University, Daegu, South Korea. Electronic address: kpnugs@knu.ac.kr.