1. U.S. National
Park Service, Great Lakes Inventory and Monitoring Network, Suite D, 2800 Lake Shore Drive East, Ashland, Wisconsin 54806, United States
2. U.S. Geological
Survey, National Wildlife Health Center, 6006 Schroeder Road, Madison, Wisconsin 53711, United States
3. National Exposure
Research Laboratory, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina 27711, United States