1. Region 5 Laboratory; US Environmental Protection Agency; Chicago Illinois USA
2. National Exposure Research Laboratory; US Environmental Protection Agency Office of Research and Development; Cincinnati Ohio USA
3. Department of Veterinary and Animal Sciences; University of Massachusetts; Amherst Massachusetts USA
4. National Enforcement Investigations Center; US Environmental Protection Agency; Denver Colorado USA
5. US Geological Survey, Colorado Cooperative Fish and Wildlife Research Unit; Colorado State University; Fort Collins Colorado USA