1. Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Republic of Korea
2. Department of Surgery, Yonsei University College of Medicine, Seoul, Republic of Korea
3. Department of Surgery, Seoul National University College of Medicine, Seoul, Republic of Korea
4. Department of Surgery, College of Medicine, Catholic University of Korea, Seoul, Republic of Korea
5. Department of Surgery, Asan Medical Center, College of Medicine University of Ulsan, Seoul, Republic of Korea
6. Department of Surgery, Pusan National University College of Medicine, Busan, Republic of Korea
7. Department of Surgery, Gachon University Gil Medical Center, Gachon University College of Medicine, Incheon, Republic of Korea
8. Department of Surgery, Chonbuk National University Medical School, Jeonju, Republic of Korea
9. Department of Surgery, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Republic of Korea