1. Disease Control and Prevention Center, National Center for Global Health and Medicine, Tokyo, Japan.
2. Infection Control Office, National Center for Global Health and Medicine, Tokyo, Japan.
3. Department of Hematology, National Center for Global Health and Medicine, Tokyo, Japan.
4. Division of Rheumatic Diseases, National Center for Global Health and Medicine, Tokyo, Japan.
5. Comprehensive Cancer Center, National Center for Global Health and Medicine, Tokyo, Japan.