1. Department of Pediatrics; Sapporo Hokuyu Hospital; Sapporo Japan
2. Department of Pediatrics; Narita Red Cross Hospital; Narita Japan
3. Department of Pediatrics; Yamagata University School of Medicine; Yamagata Japan
4. Department of Pathology, Children's Cancer Cente; National Center for Child Health and Development; Tokyo Japan
5. Department of Pediatrics; Kyushu University Graduate School of Medicine; Fukuoka Japan
6. Department of Pediatrics; Kobe University School of Medicine; Kobe Japan
7. Department of Pediatrics; Saiseikai Yokohamashi Nanbu Hospital; Yokohama Japan
8. Department of Multidisciplinary Internal Medicine, Division of Pediatrics and Perinatology; Tottori University Faculty of Medicine; Yonago Japan
9. Division of Leukemia and Lymphoma, Children's Cancer Center; National Center for Child Health and Development; Tokyo Japan
10. Department of Pediatrics; National Hospital Organization Kyusyu Cancer Center; Fukuoka Japan
11. Department of Hematology and Oncology; Gunma Children's Medical Center; Shibukawa Japan
12. Department of Pediatrics; National Hospital Organization Nagoya Medical Center; Nagoya Japan
13. Department of Pediatrics; St. Marianna University School of Medicine; Kawasaki Japan