1. Department of Microbiology, Kanagawa Prefectural Institute of Public Health
2. Department of Regional Hygiene Inspection, Kanagawa Prefectural Institute of Public Health
3. Division of Planning and Administration Office, Akita Research Center for Public Health and Environment
4. Division of Hygiene, Akita Research Center for Public Health and Environment
5. Saitama City Institute of Health Science and Research
6. Microbiology group, Shiga Prefectural Institute of Public Health
7. Department of Health Science, Fukuoka Institute of Health and Environmental Sciences
8. Department of Bacteriology I, National Institute of Infectious Diseases
9. Division of Microbiology, National Institutes of Health Sciences
10. Department of Food and Life Sciences, The Graduate School of Life and Environmental Sciences, Azabu University