1. US Geological Survey Patuxent Wildlife Research Center, Beltsville Laboratory, c/o BARC-East, Bldg. 308, 10300 Baltimore Ave., Beltsville, Maryland 20705, USA
2. Department of Clinical Sciences, College of Veterinary Medicine, Kansas State University, Manhattan, Kansas 66506, USA
3. US Fish and Wildlife Service, Migratory Birds and State Programs, PO Box 25486, Denver, Colorado 80225, USA
4. US Fish and Wildlife Service, Nevada Fish and Wildlife Office, 1340 Financial Blvd., Suite 234, Reno, Nevada 89502-7147, USA
5. US Geological Survey National Wildlife Health Research Center, 6006 Schroeder Road, Madison, Wisconsin 53711, USA