1. National Institute of Health Sciences
2. Osaka Institute of Public Health
3. Saga Prefectural Institute of Public Health and Pharmaceutical Research
4. Tokyo Metropolitan Institute of Public Health
5. Kanagawa Prefectural Institute of Public Health
6. Chiba Prefectural Institute of Public Health
7. Mie Prefecture Environmental Conservation Agency
8. Chiba Pharmaceutical Association
9. Gifu Research Center for Public Health
10. Osaka Municipal Waterworks Bureau
11. Saitama Prefectural Public Enterprise Bureau
12. Yokosuka City Waterworks and Sewerage Bureau
13. Waterworks Bureau, City of Kawasaki