1. Fort Collins Science Center U.S. Geological Survey 2150 Centre Avenue, Building C Fort Collins Colorado80526USA
2. Denver Zoological Foundation, Rio Mora National Wildlife Refuge P.O. Box 27 Watrous New Mexico87753USA
3. National Wildlife Health Center U.S. Geological Survey 6006 Schroeder Road Madison Wisconsin53711USA
4. Department of Medicine West Virginia University Morgantown West Virginia26506USA