1. Department of Hematology, Toho University Sakura Medical Center, Japan
2. Department of Blood Transfusion, Toho University Sakura Medical Center, Japan
3. Department of Hematology, International University of Health and Welfare School of Medicine, Japan
4. Tsukuba Research Institute, Sekisui Medical Co. Ltd., Japan
5. Department of Clinical-Laboratory and Experimental-Research Medicine, Toho University SakuraMedical Center, Japan