1. Department of Pediatrics; National Hospital Organization Kyushu Cancer Center; Fukuoka Japan
2. Department of Pediatrics; National Hospital Organization Fukuoka-Higashi Medical Center; Fukuoka Japan
3. Clinical Research Center; National Hospital Organization Nagoya Medical Center; Nagoya Japan
4. Division of Leukemia and Lymphoma; Children's Cancer Center; National Center for Child Health and Development; Tokyo Japan
5. Department of Clinical Biostatistics; Graduate School of Medicine; Kyoto University; Kyoto Japan
6. Department of Pediatrics; Mie University Graduate School of Medicine; Tsu Mie Japan
7. Department of Pediatrics; Okayama University; Okayama Japan
8. Department of Pediatrics; Faculty of Medicine; University of Miyazaki; Miyazaki Japan
9. Department of Pediatrics; Hirosaki University Graduate School of Medicine; Hirosaki Japan
10. Department of Pediatrics; Shiga University of Medical Science; Ohtsu Japan
11. School of Human Health Science; Faculty of Medicine; Kyoto University; Kyoto Japan
12. Department of Pediatric Hematology/Oncology; Hyougo Prefectural Kobe Children's Hospital; Kobe Japan
13. Department of Hematology/Oncology; Saitama Children's Medical Center; Saitama Japan
14. Department of Pediatrics; Kyoto Prefectural University of Medicine; Kyoto Japan
15. Department of Pediatrics; Dokkyo Medical University; Tochigi Japan
16. Department of Pediatrics; Showa University Fujigaoka Hospital; Yokohama Japan
17. Department of Pediatrics and Developmental Biology; Tokyo Medical and Dental University; Tokyo Japan