1 Division of Colorectal Surgery, Department of Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Republic of Korea.
2 Department of Surgery, College of Medicine, Taif University, Taif, Saudi Arabia.
3 Division of Colorectal Surgery, Department of Surgery, Seoul St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Republic of Korea. Electronic address: lcs0610@catholic.ac.kr.