1. Department of Legal Medicine Gunma University Graduate School of Medicine Maebashi Japan
2. Department of Oncology‐Pathology Karolinska Institutet Stockholm Sweden
3. Blood Transfusion Service Gunma University Hospital Maebashi Japan
4. Department of Hematology Gunma University Graduate School of Medicine Maebashi Japan
5. Division of Integrated Oncology Research Gunma University Initiative for Advanced Research Maebashi Japan
6. Kanto‐Koshinetsu Block Blood Center Japanese Red Cross Society Tokyo Japan
7. Department of Hematology University of Occupational and Environmental Health Kitakyushu Japan