1. Division of Environmental Chemistry, National Institute of Health Sciences
2. Osaka Institute of Public Health
3. Tokyo Metropolitan Institute of Public Health
4. Kanagawa Prefectural Institute of Public Health
5. Mie Prefecture Environmental Conservation Agency
6. Chiba Pharmaceutical Association
7. Gifu Research Center for Public Health
8. Saitama Prefectural Water Quality Management Center
9. Yonago City Waterworks Bureau
10. Nihon Waters K.K.
11. Agilent Technologies Japan, Ltd.
12. Shimadzu Corporation
13. K.K. AB Sciex
14. GL Sciences Inc.
15. Thermo Fisher Scientific K.K.