1. Department of Biology, University of Tampa, Tampa, Florida 33606
2. Department of Veterinary Science, University of Kentucky, Lexington, Kentucky 40546
3. Department of Small Animal Clinical Sciences and
4. School of Agriculture, Food Science and Veterinary Medicine, University College Dublin, Dublin 4, Ireland and
5. Department of Biomedical Sciences, Western College of Veterinary Medicine, University of Saskatchewan, Saskatoon, Saskatchewan S7N5B4, Canada
6. Quill Lake, Saskatchewan S0A3E0, Canada