1. Department of Hematology, Yokohama City University Medical Center, Minami-ku, Yokohama, Japan;
2. Division of Hematology, Tokyo Metropolitan Cancer and Infectious Disease Center Komagome Hospital, Bunkyo-ku, Tokyo, Japan;
3. Division of Hematology, Department of Medicine, Keio University School of Medicine, Tokyo, Japan;
4. Department of Hematology, NTT Medical Center Tokyo, Tokyo, Japan;
5. Department of Hematology, Kanagawa Cancer Center, Yokohama, Japan;
6. Division of Hematology, Jichi Medical University, Shimotsuke, Japan;
7. Division of Hematology, Saitama Medical Center, Jichi Medical University, Saitama, Japan;
8. Department of Hematology and Oncology, Tokai University School of Medicine, Isehara, Japan;
9. Department of Internal Medicine, Chiba Aoba Municipal Hospital, Chiba, Japan;
10. Division of Clinical Oncology and Hematology, Department of Internal Medicine, Jikei University School of Medicine, Tokyo, Japan;
11. Department of Hematology, Tokyo Medical University Hospital, Tokyo, Japan;
12. Department of Hematology and Oncology, Institute of Medical Science, University of Tokyo, Tokyo, Japan