1. Department of Haematology; Gunma University Graduate School of Medicine; Maebashi Japan
2. Gunma University Graduate School of Health Science; Maebashi Japan
3. National Hospital Organization Shibukawa Medical Centre; Shibukawa Japan
4. Blood Transfusion Service; Gunma University Hospital; Maebashi Japan
5. Oncology Centre; Gunma University Hospital; Maebashi Japan