1. ORISE Research Participation Program, National Health and Environmental Effects Research Laboratory, Mid-Continent Ecology Division, Office of Research and Development; US Environmental Protection Agency; Duluth Minnesota
2. National Health and Environmental Effects Research Laboratory, Mid-Continent Ecology Division, Office of Research and Development; US Environmental Protection Agency; Duluth Minnesota
3. National Health and Environmental Effects Research Laboratory, Toxicity Assessment Division, Office of Research and Development; US Environmental Protection Agency; Research Triangle Park North Carolina
4. US Geological Survey; Iowa City Iowa
5. Department of Civil and Environmental Engineering; University of Nevada; Reno Nevada USA
6. National Water Quality Laboratory; US Geological Survey; Denver Colorado