1. United States Fish and Wildlife Service, Chesapeake Bay Field Office, Annapolis, MD 21401.
2. Biomedical Research, Edward Via College of Osteopathic Medicine, Monroe, LA 71203.
3. Department of Biomedical Sciences and Pathobiology, VA–MD Regional College of Veterinary Medicine, Virginia Tech, Blacksburg, VA 24060.
4. Department of Fish and Wildlife Conservation, Virginia Tech, Blacksburg, VA 24061.
5. US Geological Survey, Virginia Cooperative Fish and Wildlife Research Unit, Blacksburg, VA 24061.