1. Blood Transfusion Service, Gunma University Hospital, Faculty of Medicine, Gunma University, Maebashi, Gunma, Japan,
2. Department of Hematology, Gunma University Graduate School of Medicine,
3. Division of Hematology, National Hospital Organization Shibukawa Medical Center, Shibukawa, Gunma, Japan,
4. Department of Hematology, Fujioka General Hospital, Fujioka, Gunma, Japan,
5. Gunma University Graduate School of Health Sciences, Maebashi, Gunma, Japan,
6. Division of Hematology and Oncology, Gunma Cancer Center, Ohta, Gunma, Japan,
7. Clinical Department of Pathology, Gunma University Hospital, Maebashi, Gunma, Japan,
8. Anatomic and Diagnostic Pathology, Dokkyo University School of Medicine, Mibu, Tochigi, Japan,
9. Oncology Center, Gunma University Hospital, Maebashi, Gunma, Japan