S U Bae1,2, B S Min3, N K Kim3. 1. Division of Colorectal Surgery, Department of Surgery, School of Medicine, Keimyung University and Dongsan Medical Center, Daegu, Korea. sabiston0000@hanmail.net. 2. Division of Colorectal Surgery, Department of Surgery, Colorectal Cancer Clinic, Severance Hospital, Yonsei University College of Medicine, 50 Yonsei-ro, Seodaemun-Gu, Seoul, 120-752, Korea. sabiston0000@hanmail.net. 3. Division of Colorectal Surgery, Department of Surgery, Colorectal Cancer Clinic, Severance Hospital, Yonsei University College of Medicine, 50 Yonsei-ro, Seodaemun-Gu, Seoul, 120-752, Korea.