1. Division of Microbiology, National Institute of Health Sciences, Kawasaki, Japan.
2. Department of Microbiology, Graduate School of Medical and Dental Sciences, Kagoshima University, Kagoshima, Japan.
3. Shizuoka City Institute of Environmental Sciences and Public Health, Shizuoka, Japan.
4. Division of Microbiology, Mie Prefecture Health and Environment Research Institute, Yokkaichi, Japan.
5. Utsunomiya City Institute of Public Health and Environment, Utsunomiya, Japan.
6. Shizuoka Institute of Environment and Hygiene, Fujieda, Japan.
7. Department of Microbiology, Kumamoto Prefectural Institute of Public-Health and Environmental Science, Uto, Japan.
8. Life Science Division, Saitama City Institute of Health Science and Research, Saitama, Japan.
9. Division of Microbiology, Kawasaki City Institute for Public Health, Kawasaki, Japan.
10. Department of Microbiology, Tokyo Metropolitan Institute of Public Health, Tokyo, Japan.
11. Saitama Institute of Public Health, Saitama, Japan