1. Center for Colorectal Cancer, National Cancer Center, Goyang, Korea.
2. Department of Radiology, National Cancer Center, Goyang, Korea.
3. Department of Laboratory Medicine, Catholic Kwandong University College of Medicine, Incheon, Korea.
4. National Cancer Control Institute, National Cancer Center, Goyang, Korea.
5. Department of Preventive Medicine, Seoul National University College of Medicine, Seoul, Korea.
6. Center for Preventive Medicine and Public Health, Seoul National University Bundang Hospital, Seongnam, Korea.
7. Department of Internal Medicine, Seoul National University College of Medicine, Seoul, Korea.
8. Department of Surgery, The Catholic University of Korea Saint Vincent's Hospital, Suwon, Korea.
9. Department of Internal Medicine, Yonsei University College of Medicine, Seoul, Korea.
10. Department of Pathology, Korea University College of Medicine, Seoul, Korea.
11. Department of Radiology, Hanyang University College of Medicine, Seoul, Korea.
12. Department of Internal Medicine, Chungang University College of Medicine, Seoul, Korea.
13. Department of Internal Medicine, Yonsei University Wonju College of Medicine, Wonju, Korea.
14. Department of Preventive Medicine, Yonsei University College of Medicine, Seoul, Korea.
15. Department of Internal Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University School of Medicine, Seoul, Korea.
16. Department of Surgery, Korea University Ansan Hospital, Ansan, Korea.
17. Department of Radiology, The Catholic University of Korea College of Medicine, Seoul, Korea.
18. Department of Family Medicine/Health Promotion Center, KEPCO Medical Center, Seoul, Korea.
19. Department of Family Medicine, Kangdong Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea.
20. Department of Preventive Medicine, The Catholic University of Korea College of Medicine, Seoul, Korea.
21. Department of Surgery, Seoul National University College of Medicine, Seoul, Korea.