1. Department of Haematology/Oncology; Saitama Children's Medical Centre; Saitama Japan
2. Department of Paediatrics; the University of Tokyo; Tokyo Japan
3. Department of Paediatrics; St. Luke's International Hospital; Tokyo Japan
4. Department of Health Policy; National Research Institute for Child Health and Development; Tokyo Japan
5. Department of Paediatrics; Showa University Fujigaoka Hospital; Yokohama Japan
6. Department of Paediatrics; St. Marianna University School of Medicine; Kawasaki Japan
7. Department of Paediatrics; Nippon Medical School; Tokyo Japan
8. Department of Haematology/Oncology; Chiba Children's Hospital; Chiba Japan
9. Department of Paediatrics; Tokyo Medical and Dental University; Tokyo Japan
10. Department of Haematology/Oncology; Tokyo Metropolitan Children's Medical Centre; Tokyo Japan
11. Department of Paediatrics; University of Yamanashi; Yamanashi Japan
12. Department of Paediatrics; Teikyo University; Tokyo Japan
13. Department of Paediatrics; Ibaraki Children's Hospital; Ibaraki Japan
14. Department of Paediatrics; Toho University; Tokyo Japan