1. Department of Internal Medicine; Asan Medical Center, University of Ulsan College of Medicine; Seoul South Korea
2. Department of Oncology; Asan Medical Center, University of Ulsan College of Medicine; Seoul South Korea
3. Department of Clinical Epidemiology and Biostatistics; Asan Medical Center, University of Ulsan College of Medicine; Seoul South Korea
4. Division of Hematology-Oncology, Department of Internal Medicine; Konkuk University School of Medicine, Konkuk University; Seoul South Korea
5. Department of Hematology-Oncology; Kyungpook National University Hospital; Daegu South Korea
6. Department of Hemato-Oncology; Keimyung University Dongsan Medical Center; Daegu South Korea
7. Division of Hematology/Oncology; Gachon University Gil Medical Center; Incheon South Korea
8. Division of Hematology-oncology, Department of Internal Medicine; Korea University School of Medicine; Seoul South Korea
9. Department of Internal Medicine; Kosin University College of Medicine; Busan South Korea
10. Department of Hematology-Oncology; Center for Hematologic Malignancy, National Cancer Center; Goyang-si South Korea
11. Department of Internal Medicine; Pusan National University Hospital; Busan South Korea
12. Department of Internal Medicine; Seoul St. Mary's Hospital, The Catholic University of Korea; Seoul South Korea
13. Department of Internal Medicine; Yonsei University College of Medicine, Severance Hospital; Seoul South Korea
14. Department of Hematology and Oncology; Ulsan University Hospital, University of Ulsan College of Medicine; Ulsan South Korea
15. Department of Internal Medicine; Korea Cancer Center Hospital, Korea Institute of Radiological and Medical Sciences; Seoul South Korea
16. Department of Internal Medicine; Ewha Womans University School of Medicine; Seoul South Korea
17. Department of Internal Medicine; Inje University Busan Paik Hospital; Busan South Korea
18. Department of Hematology-Oncology; Chonnam National University Hwasun Hospital; Hwasun South Korea
19. Division of Hematology/Oncology, Department of Medicine; Sungkyunkwan University School of Medicine, Samsung Medical Center; Seoul South Korea