1. Department of Haematology/Oncology; Gunma Children's Medical Centre; Shibukawa Japan
2. Department of Paediatrics; Gunma University Graduate School of Medicine; Maebashi Japan
3. Division of Leukaemia and Lymphoma; Children's Cancer Centre; National Centre for Child Health and Development; Tokyo Japan
4. Department of Paediatrics; Shiga University of Medical Science; Shiga Japan
5. Department of Paediatric Haematology and Oncology Research National Research Institute for Child Health and Development; Tokyo Japan
6. Department of Paediatrics; National Hospital Organization Osaka National Hospital; Osaka Japan
7. Department of Paediatrics; National Hospital Organization Nagoya Medical Centre; Nagoya Japan
8. Department of Human Health Sciences; Kyoto University Graduate School of Medicine; Kyoto Japan