1. Department of Hematology, Chiba University Hospital, Chiba, Japan;
2. Blood and Marrow Transplant Center, Chiba University Hospital, Chiba, Japan;
3. Department of Transfusion Medicine and Cell Therapy, Chiba University Hospital, Chiba, Japan;
4. Department of Hematology, International University of Health and Welfare School of Medicine, Narita, Japan