1. Department of Pediatrics, Graduate School of Medicine Kyoto University Kyoto Japan
2. Children Cancer Center National Center for Child Health and Development Tokyo Japan
3. Department of Innovative Medicine, Division of Stem Cell Transplantation Tokai University School of Medicine Isehara Japan
4. Department of Hematology/Oncology Osaka Women's and Children's Hospital Osaka Japan
5. Department of Pediatrics National Hospital Organization Kyushu Cancer Center Fukuoka Japan
6. Department of Hematology and Oncology Children's Medical Center, Japanese Red Cross Aichi Medical Center Nagoya First Hospital Nagoya Japan
7. Department of Hematology/Oncology Saitama Children's Medical Center Saitama Japan
8. Department of Pediatrics Tokai University School of Medicine Isehara Japan
9. Division of Hematology/Oncology Kanagawa Children's Medical Center Yokohama Japan
10. Division of Pediatric Hematology and Oncology Ibaraki Children's Hospital Ibaraki Japan
11. Department of Pediatrics Nagoya University Graduate School of Medicine Nagoya Japan
12. Department of Pediatrics Hiroshima Red Cross Hospital & Atomic‐bomb Survivors Hospital Hiroshima Japan
13. Department of Hematology and Oncology Miyagi Children's Hospital Sendai Japan
14. Department of pediatrics Osaka International Cancer Institute Osaka Japan
15. Division of Pediatrics Tokyo Metropolitan Cancer and Infectious Disease Center Komagome Hospital, Bureau of Social Welfare and Public Health, Tokyo Metropolitan Government Tokyo Japan
16. Japanese Data Center for Hematopoietic Cell Transplantation Nagoya Japan
17. Department of Registry Science for Transplant and Cellular Therapy Aichi Medical University School of Medicine Nagakute Japan
18. Division of Endocrinology, Diabetes and Metabolism, Hematology, Rheumatology (Second Department of Internal Medicine), Graduate School of Medicine University of the Ryukyus Nishihara‐cho Japan
19. Department of Hematology and Oncology, Graduate School of Medicine Kyoto University Kyoto Japan