1. Pennsylvania Cooperative Fish and Wildlife Research Unit, Department of Ecosystem Science and Management, The Pennsylvania State University, University Park, PA 16802.
2. Bureau of Wildlife Management, Pennsylvania Game Commission, Harrisburg, PA 17110.
3. Department of Veterinary and Biomedical Sciences, The Pennsylvania State University, University Park, PA 16802.
4. US Geological Survey, Pennsylvania Cooperative Fish and Wildlife Research Unit, The Pennsylvania State University, University Park, PA 16802.