1. Division of Colorectal Surgery, Department of Surgery, Seoul St Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Republic of Korea
2. Division of Colorectal Surgery, Department of Surgery, Incheon St Mary’s Hospital, College of Medicine, The Catholic University of Korea, Incheon, Republic of Korea
3. Division of Colorectal Surgery, Department of Surgery, St Vincent’s Hospital, College of Medicine, The Catholic University of Korea, Suwon, Republic of Korea