1. Department of Hematology, Gunma University Graduate School of Medicine, Japan
2. Infection Control and Prevention Center, Gunma University Hospital, Japan
3. Division of Blood Transfusion Service, Gunma University Hospital, Japan
4. Department of Laboratory Sciences, Gunma University Graduate School of Health Science, Japan
5. Department of Pathology, Gunma University Hospital, Japan
6. Oncology Center, Gunma University Hospital, Japan