1. Department of Surgery, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.
2. Division of Colorectal Surgery, Department of Surgery, St. Vincent’s Hospital, College of Medicine, The Catholic University of Korea, Suwon, Korea.
3. Division of Colon and Rectal Surgery, Department of Surgery, Korea University Guro Hospital, Korea University College of Medicine, Korea University, Seoul, Korea.
4. Department of Surgery, Chonnam National University Hwasun Hospital, Chonnam National University Medical School, Hwasun, Korea.
5. Department of Surgery, Incheon St. Mary’s Hospital, College of Medicine, The Catholic University Hospital, Incheon, Korea.
6. Department of Surgery, CHA Bundang Medical Center, Seongnam, Korea.
7. Department of Surgery, Kyung Hee University College of Medicine, Seoul, Korea.