1. Infectious Disease Surveillance Center, National Institute of Infectious Diseases, Tokyo, Japan.
2. National Hospital Organization Mie National Hospital, Mie, Japan.
3. Fukuoka Welfare Center for the Disabled, Fukuoka, Japan.
4. Ryoumou Seishi Ryogoen for the Severely Disabled, Gunma, Japan.
5. Kawasaki City Institute for Public Health, Kawasaki, Japan.