1. Laboratory of Infectious Agents Surveillance, Kitasato Institute for Life Sciences, Kitasato University, 5-9-1 Shirokane, Minatoku, Tokyo, Japan
2. Kitasato Institute for Life Sciences & Graduate School of Infection Control Sciences, Kitasato University, Tokyo, Japan
3. National Hospital Organization Tokyo Medical Center, Tokyo, Japan
4. Medical Corporation Nagatsu-kai Saito Hospital, Chiba, Japan
5. Osaka Rosai Hospital, Osaka, Japan
6. Hakujikai Memorial Hospital, Tokyo, Japan
7. Saiseikai Ibaraki Hospital, Osaka, Japan