1. Department of Pediatrics Graduate School of Medicine Kyoto University Kyoto Japan
2. Department of Pediatric Hematology and Oncology Osaka City General Hospital
3. Department of Pathology Osaka City General Hospital
4. Department of Pediatrics Graduate School of Medicine The University of Tokyo Tokyo Japan
5. Department of Pediatrics Hiroshima University Graduate School of Biomedical Sciences Hiroshima Japan
6. Cancer Consultation and Support Center Osaka City General Hospital
7. Department of Pathology and Tumor Biology Graduate School of Medicine Kyoto University Kyoto Japan
8. Institute for the Advanced Study of Human Biology (WPI‐ASHBi) Kyoto University Kyoto Japan
9. Department of Medicine Center for Hematology and Regenerative Medicine Karolinska Institute Stockholm Sweden