1. Department of Biological Sciences Central Washington University Ellensburg WA U.S.A
2. Office of Research and Development National Risk Management Research Laboratory US EPA Cincinnati OH U.S.A
3. Office of Research and Development National Exposure Research Laboratory US EPA Cincinnati OH U.S.A
4. Office of Research and Development National Health and Environmental Effects Research Laboratory US EPA Duluth MN U.S.A
5. Office of Research and Development National Health and Environmental Effects Research Laboratory US EPA Corvallis OR U.S.A
6. Department of Geology and Earth Systems Interdisciplinary Center University of Maryland College Park MD U.S.A
7. Pegasus Technical Services Cincinnati OH U.S.A