1. Division of Colorectal Surgery, Department of Surgery, Seoul St Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
2. Department of Surgery, College of Medicine, Taif University, Taif, Saudi Arabia.
3. Department of Anesthesiology and Pain Medicine, Seoul St Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.
4. Division of Colorectal Surgery, Department of Surgery, Seoul St Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea.