1. Department of Internal Medicine, Seoul National University Hospital, Seoul National University College of Medicine, Seoul, Korea
2. Department of Hematology, Seoul St. Mary’s Hematology Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
3. Department of Laboratory Medicine, College of Medicine, The Catholic University of Korea, Seoul, Korea
4. Department of Hematology, Yeoido St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
5. Department of Hematology, Eunpyeong St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, Korea
6. Department of Hematology, Incheon St. Mary's Hospital, College of Medicine, The Catholic University of Korea, Incheon, Korea