1. Division of Pediatrics; Faculty of Medicine; University of Miyazaki; Miyazaki Japan
2. Clinical Research Center; Nagoya Medical Center; National Hospital Organization; Nagoya Japan
3. Department of Pharmacoepidemiology; Graduate School of Medicine and Public Health; Kyoto University; Kyoto Japan
4. Department of Pediatrics; National Hospital Organization; Fukuoka-Higashi Medical Center; Fukuoka Japan
5. Department of Pediatrics; Osaka University School of Medicine; Osaka Japan
6. Department of Pediatrics; Mie University Graduate School of Medicine; Tsu Japan
7. Department of Pediatrics; Okayama University; Okayama Japan
8. Department of Pediatrics; Hirosaki University Graduate School of Medicine; Hirosaki Japan
9. Department of Pediatrics; Gunma University Graduate School of Medicine; Maebashi Japan
10. Department of Hematology/Oncology; Gunma Children's Medical Center; Shibukawa Japan
11. Division of Leukemia and Lymphoma; National Center for Child Health and Development; Children's Cancer Center; Tokyo Japan
12. Department of Pediatrics; Shiga University of Medical Science; Otsu Japan
13. Division of Hemato-Oncology/Regenerative Medicine; Kanagawa Children's Medical Center; Yokohama Japan
14. Department of Pediatrics; St. Luke's International Hospital; Tokyo Japan
15. Department of Pediatrics and Developmental Biology; Tokyo Medical and Dental University; Tokyo Japan
16. Department of Human Health Sciences; Kyoto University; Kyoto Japan