1. Department of Surgery, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.
2. Department of Surgery, Severance Hospital, Yonsei University College of Medicine, Seoul, Korea.
3. Department of Surgery, Seoul National University College of Medicine, Seoul, Korea.
4. Department of Surgery, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea.
5. Department of Surgery, Pusan National University School of Medicine, Pusan National University Yangsan Hospital, Yangsan, Korea.
6. Department of Surgery, Catholic University of Daegu School of Medicine, Daegu, Korea.
7. Department of Surgery, Ajou University Hospital, Ajou University College of Medicine, Suwon, Korea.
8. Department of Surgery, Korean University Anam Hospital, Korean University College of Medicine, Seoul, Korea.
9. Department of Surgery, Ulsan University Hospital, University of Ulsan College of Medicine, Ulsan, Korea.
10. Department of Surgery, College of Medicine, The Catholic University of Korea, Seoul, Korea.
11. Department of Surgery, Keimyung University School of Medicine, Daegu, Korea.
12. Department of Surgery, Jeonbuk National University Hospital, Jeonbuk National University College of Medicine, Jeonju, Korea.
13. Department of Surgery, Busan Paik Hospital, Inje University College of Medicine, Busan, Korea.
14. Department of Convergence Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea.