1. Department of Surgery, Gangnam Severance Hospital, Seoul, Korea.
2. Department of Surgery, Samsung Medical Center, Seoul, Korea.
3. Department of Surgery, Asan Medical Center, Seoul, Korea.
4. Department of Surgery, Ajou University School of Medicine, Suwon, Korea.
5. Department of Surgery, Gachon University Gil Hospital, Incheon, Korea.
6. Department of Surgery, Yeungnam University College of Medicine, Daegu, Korea.
7. Department of Surgery, CHA University Ilsan Medical Center, Goyang, Korea.
8. Department of Surgery, Seoul National University College of Medicine, Seoul, Korea.
9. Division of Oncology/Hematology, Department of Internal Medicine, Korea University College of Medicine, Seoul, Korea.
10. Department of Surgery, Kangbuk Samsung Hospital, Seoul, Korea.
11. Department of Surgery, Soonchunhyang University Seoul Hospital, Seoul, Korea.
12. Department of Surgery, Jeonbuk National University Medical School, Jeonju, Korea.
13. Department of Surgery, Busan St. Mary's Hospital, Busan, Korea.
14. Department of Surgery, Konkuk University Medical Center, Choongju, Korea.
15. Department of Surgery, Kyung Hee University Hospital, Seoul, Korea.
16. Department of Surgery, Ulsan University Hospital, Ulsan, Korea.
17. Department of Surgery, Inje University Sanggye Paik Hospital, Seoul, Korea.
18. Department of Surgery, Hanyang University Hospital, Seoul, Korea.
19. Department of Surgery, Soonchunhyang University Cheonan Hospital, Cheonan, Korea.
20. Department of Surgery, Dong-A University Hospital, Busan, Korea.
21. Department of Surgery, Kangseo MizMedi Hospital, Seoul, Korea.
22. Department of Surgery, Dankook University Hospital, Cheonan, Korea.
23. Department of Surgery, Ewha Woman's University Mokdong Hospital, Seoul, Korea.
24. Department of Surgery, Hallym University Sacred Heart Hospital, Anyang, Korea.
25. Department of Surgery, Gangseo Mizmedi Hospital, Seoul, Korea.
26. Department of Surgery, Chonnam National University Medical School, Gwangju, Korea.
27. Department of Surgery, Inje University Busan Paik Hospital, Busan, Korea.
28. Department of Surgery, Keimyung University School of Medicine, Daegu, Korea.
29. Department of Surgery, Soonchunhyang University Bucheon Hospital, Bucheon, Korea.
30. Department of Surgery, Pusan National University Hospital, Busan, Korea.
31. Department of Pathology, Asan Medical Center, Seoul, Korea.
32. Department of Pathology, Yeungnam University College of Medicine, Daegu, Korea.
33. Department of Pathology, Seoul St. Mary's Hospital, The Catholic University of Korea, Seoul, Korea.