1. Disease Control and Prevention Center, National Center for Global Health and Medicine, Tokyo, Japan.
2. Department of Refractory Viral Infections, National Center for Global Health and Medicine Research Institute, Tokyo, Japan.
3. Department of Hematology, National Center for Global Health and Medicine, Tokyo, Japan.
4. Department of Intractable Diseases, National Center for Global Health and Medicine, Tokyo, Japan.
5. Japanese Red Cross Central Blood Institute, Tokyo, Japan.
6. Japanese Red Cross Kanto-Koshinetsu Block Blood Center, Tokyo, Japan.
7. Department of Safety Research on Blood and Biological Products, National Institute of Infectious Diseases, Tokyo, Japan.