1. Department of Pediatrics Kagoshima University Graduate School of Medical and Dental Sciences Kagoshima Japan
2. Department of Pediatrics Shinshu University School of Medicine Matsumoto Japan
3. Department of Hematology/Oncology Osaka Women's and Children's Hospital Osaka Japan
4. Department of Hematology and Oncology Shizuoka Children's Hospital Shizuoka Japan
5. Division of Hemato‐Oncology/Regenerative Medicine Kanagawa Children's Medical Center Yokohama Japan
6. Department of Hematology and Oncology Children's Medical Center Japanese Red Cross Nagoya First Hospital Nagoya Japan
7. Department of Pediatrics National Kyushu Cancer Center Fukuoka Japan
8. Department of Pediatric Oncology Fukushima Medical University Hospital Fukushima Japan
9. Pediatrics Osaka University Graduate School of Medicine Osaka Japan
10. Department of Healthcare Administration Nagoya University Graduate School of Medicine Nagoya Japan
11. Japanese Data Center for Hematopoietic Cell Transplantation Nagoya Japan
12. Children's Cancer Center National Center for Child Health and Development Tokyo Japan