1. Department of Laboratory Medicine; Shinshu University Hospital; Matsumoto
2. Department of Haematology and Oncology; Children's Medical Centre; Japanese Red Cross Nagoya First Hospital; Nagoya
3. Department of Paediatrics; Shinshu University School of Medicine; Matsumoto
4. Centre of Bone Marrow Transplantation; Ryukyu University Hospital; Okinawa
5. Department of Paediatrics; Juntendo University School of Medicine; Tokyo
6. Department of Paediatrics; Tokyo Women's Medical University Medical Centre East; Tokyo
7. Department of Paediatrics; Niigata Cancer Centre Hospital; Niigata
8. Division of Haematology-Oncology; Gunma Children's Medical Centre; Shibukawa
9. Department of Child Health; Faculty of Medicine; University of Tsukuba; Tsukuba
10. Division of Haematology; Second Department of Internal Medicine; Shinshu University School of Medicine; Matsumoto
11. Department of Paediatrics; St Luke's International Hospital; Tokyo
12. Department of Paediatrics; Nagoya University Graduate School of Medicine; Nagoya; Japan