1. Department of Pediatrics, Yokohama City University Hospital, Yokohama, Japan;
2. Department of Hematology/Oncology, Gunma Children’s Medical Center, Shibukawa, Japan;
3. Clinical Research Center, National Hospital Organization Nagoya Medical Center, Nagoya, Japan;
4. Department of Pathology and Tumor Biology, Graduate School of Medicine, Kyoto University, Kyoto, Japan;
5. Department of Pediatrics, Gunma University Graduate School of Medicine, Maebashi, Japan;
6. Center for Cancer Genomics and Advanced Therapeutics, National Cancer Center, Tokyo, Japan;
7. Department of Human Health Sciences, Kyoto University Graduate School of Medicine, Kyoto, Japan;
8. Center for Advanced Medicine and Clinical Research, Nagoya University Hospital, Nagoya, Japan;
9. Laboratory of Sequence Analysis, Human Genome Center, Institute of Medical Science, University of Tokyo, Tokyo, Japan;
10. Department of Pediatric Hematology and Oncology Research, National Research Institute for Child Health and Development, Tokyo, Japan;
11. Department of Pediatrics, Hokkaido University Graduate School of Medicine, Sapporo, Japan;
12. Division of Leukemia and Lymphoma, Children’s Cancer Center, National Center for Child Health and Development, Tokyo, Japan;
13. Department of Medical Technology, Kyorin University Faculty of Health Sciences, Mitaka, Japan;
14. Department of Pediatrics, Okayama University Graduate School of Medicine, Okayama, Japan;
15. Department of Pediatrics, Shiga University of Medical Science, Ohtsu, Japan;
16. Department of Pediatrics, National Hospital Organization Osaka National Hospital, Osaka, Japan;
17. Laboratory of DNA Information, Human Genome Center, Institute of Medical Science, University of Tokyo, Tokyo, Japan;
18. Institute for the Advanced Study of Human Biology (WPI-ASHBi), Kyoto University, Kyoto, Japan;
19. Department of Medicine, Centre for Haematology and Regenerative Medicine, Karolinska Institute, Stockholm, Sweden; and
20. Institute of Physiology and Medicine, Jobu University, Takasaki, Japan