Affiliation: | 1. Department of Haematology/Oncology, Gunma Children's Medical Centre, , Gunma, Japan;2. Department of Paediatrics, Gunma University Graduate School of Medicine, , Gunma, Japan;3. Division of Haematology and Oncology, Shizuoka Children's Hospital, , Shizuoka, Japan;4. Department of Paediatrics, Hirosaki University Graduate School of Medicine, , Hirosaki, Japan;5. Department of Paediatrics Haematology/Oncology, Osaka City General Hospital, , Osaka, Japan |