1. Department of Hematology/Oncology for Children and AdolescentsSapporo Hokuyu Hospital Sapporo Hokkaido Japan
2. Department of PediatricsHiroshima Red Cross Hospital and Atomic‐bomb Survivors Hospital Hiroshima Hiroshima Prefecture Japan
3. Department of Oncology and HematologyShimane University Hospital Innovative Cancer Center Izumo Shimane Prefecture Japan
4. Department of Medicine and Biosystemic ScienceKyushu University Graduate School of Medical Sciences Fukuoka Fukuoka Prefecture Japan
5. Department of HematologyHyogo Prefectural Amagasaki General Medical Center Amagasaki Hyogo Prefecture Japan
6. Department of Hematopoietic Stem Cell TransplantationNational Cancer Center Hospital Chuo‐ku Tokyo Japan
7. Department of Hematology/OncologyOsaka Women's and Children's Hospital Izumi Osaka Prefecture Japan
8. Division of Hemato‐oncology/Regenerative MedicineKanagawa Children's Medical Center Yokohama Kanagawa Prefecture Japan
9. Department of Hematology and OncologyChildren's Medical Center Japanese Red Cross Nagoya First Hospital Nagoya Aichi Prefecture Japan
10. Department of HematologyHiroshima Red Cross Hospital and Atomic‐bomb Survivors Hospital Hiroshima Hiroshima Prefecture Japan
11. Department of Internal Medicine (Hematology)Toyama Prefectural Central Hospital Toyama Toyama Prefecture Japan
12. Department of HematologyHamanomachi Hospital Fukuoka Fukuoka Prefecture Japan
13. PediatricsOsaka University Graduate School of Medicine Suita Osaka Prefecture Japan
14. Japanese Data Center for Hematopoietic Cell Transplantation Nagoya Aichi Prefecture Japan
15. Department of PediatricsYamagata University Hospital Yamagata Yamagata Prefecture Japan