1. Gulf Ecosystem Measurement & Modeling Division, US Environmental Protection AgencyGulf Breeze Florida USA
2. Exposure Methods and Measurement Division, US Environmental Protection AgencyAthens Georgia USA
3. Grantee to the US Environmental Protection Agency via Oak Ridge Institute for Science and Education, Exposure Methods and Measurement Division, US Environmental Protection AgencyAthens Georgia USA
4. Research Cores Unit, National Health and Environmental Effects Response Laboratory, Research Triangle Park North Carolina USA