Jichi Medical University Saitama Medical Center - Division of Hematology, Jichi Medical University Saitama Medical Center - Division of Hematology, National Cancer Center Hospital - Division of Hematopoietic Stem Cell Transplantation, Dokkyo Medical University - Department of Haematology and Oncology, Kyoto University Graduate School of Medicine - Department of Hematology and Oncology, Komagome Hospital - Tokyo Metropolitan Cancer and Infectious Diseases Center, Hematology Division, Japanese Red Cross Nagoya First Hospital - Department of Hematology, Kanagawa Cancer Center - Department of Hematology, Toranomon Hospital - Federation of National Public Service Personnel Mutual Aid Associations, Department of Hematology, Jichi Medical University Saitama Medical Center - Division of Hematology, Hiroshima Red Cross Hospital and Atomic Bomb Survivors Hospital - Department of Hematology, Hokkaido University - Hokkaido University Hospital, Sapporo Hokuyu Hospital - Department of Hematology, Okayama University - Department of Hematology and Oncology, Tokai University School of Medicine - Department of Hematology and Oncology, National Cancer Center Hospital - Division of Hematopoietic Stem Cell Transplantation, Japanese Data Center for Hematopoietic Cell Transplantation, Nagoya University Graduate School of Medicine - Department of Hematology and Oncology, Nagoya University - Department of Hematology and Oncology and Jichi Medical University Saitama Medical Center - Division of Hematology