1. Department of Pediatric Hematology/Oncology Osaka City General Hospital Osaka Japan
2. Department of Pediatric Oncology National Cancer Center Hospital Tokyo Japan
3. Department of Pediatrics Graduate School of Medicine The University of Tokyo Tokyo Japan
4. Department of Diagnostic Pathology Osaka City Juso Hospital Osaka Japan
5. Department of Diagnostic Pathology Osaka City General Hospital Osaka Japan
6. Department of Pathology Kanagawa Children's Medical Center Yokohama Kanagawa Japan
7. Department of Pathology National Center for Child Health and Development Tokyo Japan
8. Division of Diagnostic Pathology Keio University Tokyo Japan
9. Division of Pediatric Neurosurgery Osaka City General Hospital Osaka Japan