1. Division of Hematology and Oncology, Department of Medicine, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea;
2. Department of Internal Medicine, Korea Cancer Center Hospital, Seoul, Korea;
3. Division of Hematology, Department of Internal Medicine; Yonsei University College of Medicine, Seoul, Korea;
4. Department of Internal Medicine, Dong-A University College of Medicine, Busan, Korea;
5. Department of Internal Medicine, Korea University Guro Hospital, Korea University College of Medicine, Seoul, Korea;
6. Department of Internal Medicine, Dankook University College of Medicine, Cheonan, Korea;
7. Department of Internal Medicine, Soon Chun Hyang University Hospital, Seoul, Korea;
8. Department of Internal Medicine, Yeungnam University College of Medicine, Daegu, Korea;
9. Department of Hematology-Oncology, Kangdong Sacred Heart Hospital, Hallym University College of Medicine, Seoul, Korea;
10. Department of Internal Medicine, Ewha Women's University School of Medicine, Seoul, Korea;
11. Department of Internal Medicine, Chonbuk National University Medical School, Jeonju, Korea;
12. Department of Internal Medicine, Jeju University College of Medicine, Jeju, Korea;
13. Department of Medicine, Chung-Ang University College of Medicine, Seoul, South Korea;
14. Department of Internal Medicine, Hallym University Sacred Heart Hospital, Hallym University College of Medicine, Anyang, Korea;
15. Division of Hematology/Oncology, Gachon University Gil Hospital, Gachon University of Medicine and Science, Incheon, Korea;
16. Department of Internal Medicine, Kangbuk Samsung Hospital, Sungkyunkwan University, School of Medicine, Seoul, Korea;
17. Department of Pathology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea;
18. Department of Pathology, Samsung Medical Center, Sungkyunkwan University School of Medicine, Seoul, Korea; and
19. Department of Oncology, Asan Medical Center, University of Ulsan College of Medicine, Seoul, Korea