1. Department of Paediatric Haematology-Oncology; Research Hospital; Institute of Medical Science; University of Tokyo; Tokyo Japan
2. Department of Paediatrics; Kanto Central Hospital of the Mutual Aid Association of Public School Teachers; Tokyo Japan
3. Department of Paediatric Haematology-Oncology; Saitama Medical University International Medical Centre; Saitama Japan
4. Department of Paediatrics; St. Luke's International Hospital; Tokyo Japan
5. Division of Transfusion Medicine and Cell Therapy; Chiba University Hospital; Chiba Japan
6. Department of Transfusion Medicine, Cell Therapy; Graduate School of Medicine Kyoto University; Kyoto Japan
7. National Hospital Organization Shinshu Ueda Medical Centre; Ueda Japan