1. Department of Pediatrics; Okayama University Graduate School of Medicine; Okayama Japan
2. Department of Hematology/Oncology; Hyogo Children's Hospital; Kobe Japan
3. Department of Pediatrics; Osaka University Hospital; Osaka Japan
4. Department of Pediatrics; Toyonaka Municipal Hospital; Osaka Japan
5. Department of Pediatrics; Kochi Health Sciences Center; Kochi Japan
6. Department of Pediatric Hematology and Oncology; Okayama University Hospital; Okayama Japan