1. Department of Surgery, Yonsei University Gangnam Severance Hospital, Seoul, Korea
2. Department of Surgery, Chung-Ang University Hospital, Seoul, Korea
3. Department of Surgery, Gumdan Top General Hospital, Incheon, Korea
4. Department of Surgery, Dankook University Hospotal, Cheonan, Korea
5. Department of Surgery, Catholic University of Korea, St. Paul’s Hospital, Seoul, Korea
6. Department of Surgery, Gachon University Gil Medical Center, Incheon, Korea
7. Department of Surgery, Chosun University Hospital, Gwangju, Korea
8. Department of Surgery, Soonchunhyang University Seoul Hospital, Seoul, Korea
9. Department of Surgery, Catholic University of Korea, Yeouido St. Mary’s Hospital, Seoul, Korea
10. Department of Surgery, Korea University Ansan Hospital, Ansan, Korea
11. Department of Surgery, Wellness Hospital, Busan, Korea
12. Department of Surgery, Catholic University of Korea, Incheon St. Mary’s Hospital, Incheon, Korea
13. Department of Surgery, Chonnam National University Hospital, Gwangju, Korea
14. Department of Surgery, Keimyung Univsity Dongsan Hospital, Daegu, Korea
15. Department of Surgery, Seoul National University Bundang Hospital, Seongnam, Korea
16. Department of Surgery, Ulsan University Hospital, Ulsan, Korea
17. Department of Surgery, Korea University Anam Hospital, Korea
18. Department of Surgery, Seoul Slim Surgery, Seoul, Korea
19. Department of Surgery, Kyungpook National University Chilgok Hospital, Daegu, Korea
20. Department of Surgery, Kosin University Gospel Hospital, Korea
21. Department of Surgery, Inje University Haeundae Paik Hospital, Busan, Korea
22. Department of Surgery, Hallym University Sacred Heart Hospital, Anyang, Korea
23. Department of Surgery, Seoul National University-SMG Boramae Hospital, Seoul, Korea
24. Department of Surgery, Asan Medical Center, Seoul, Korea
25. Department of Surgery, Catholic University of Korea, Daejeon St. Mary’s Hospital, Daejeon, Korea
26. Department of Surgery, Catholic University of Korea, Seoul St. Mary’s Hospital, Seoul, Korea
27. Department of Surgery, Catholic University of Korea, Uijeongbu St. Mary’s Hospital, Seoul, Korea
28. Department of Surgery, Seoul National University Hospital, Seoul, Korea
29. Department of Surgery, Catholic University of Korea, St. Vincent’s Hospital, Suwon, Korea
30. Department of Surgery, Kangbuk Samsung Hospital, Seoul, Korea
31. Department of Surgery, Seoul 365MC Hospital, Seoul, Korea
32. Department of Surgery, Catholic Kwandong University International St. Mary’s Hospital, Incheon, Korea
33. Department of Surgery, Hanyang University Medical Center, Seoul, Korea
34. Department of Surgery, CHA University Hospital, Seoungnam, Korea
35. Department of Surgery, Ajou University Hospital, Suwon, Korea
36. Department of Surgery, Inha University Hospital, Incheon, Korea
37. Department of Surgery, Yonsei University Severance Hospital, Seoul, Korea, Korea
38. Department of Surgery, Ewha Medical Center, Seoul, Korea, Korea