Nagoya University - Department of Advanced Medicine, Japanese Red Cross Nagoya First Hospital, Jichi Medical University Saitama Medical Center - Division of Hematology, Japanese Red Cross Society, Toranomon Hospital - Federation of National Public Service Personnel Mutual Aid Associations, Department of Hematology, National Cancer Center Hospital - Division of Hematopoietic Stem Cell Transplantation, Hyogo College of Medicine, Komagome Hospital, Hamanomachi Hospital, Japanese Red Cross Nagoya First Hospital - Department of Hematology, Hokkaido University - Hokkaido University Hospital, Hiroshima Red Cross Hospital and Atomic-bomb Survivors Hospital, Okayama University - Department of Hematology and Oncology, National Hospital Organization (NHO), Hiroshima University, Japanese Data Center for Hematopoietic Cell Transplantation and Keio University