1. School of Public and Environmental Affairs Indiana University Bloomington, Indiana 47405
2. Midwest Center for Environmental Science and Public Policy Milwaukee, Wisconsin 53202
3. Department of Biological Statistics and Computational Biology Cornell University Ithaca, New York 14853
4. Department of Natural Resources Cornell University Ithaca, New York 14853
5. AXYS Analytical Services Ltd. P.O. Box 2219 2045 Mills Road Sidney, British Columbia, Canada V8L 3S8
6. Institute for Health and the Environment University at Albany Rensselaer, New York 12144