1. Department of Transfusion Medicine, Cell Therapy and Regenerative Medicine Niigata University Medical and Dental Hospital Niigata Japan
2. Japanese Red Cross Kanto‐Koshinetsu Block Blood Center Tokyo Japan
3. Department of Hematology Niigata University Faculty of Medicine Niigata Japan
4. Department of Hematology Sado General Hospital Niigata Japan
5. Niigata Red Cross Blood Center Niigata Japan
6. Sado General Hospital Niigata Japan
7. Japanese Red Cross Central Blood Institute Tokyo Japan