1. College of Veterinary Medicine and Biomedical Sciences, Department of Clinical Sciences, 1601 Campus Delivery, Fort Collins, CO 80523-1678 USA
2. 29 Aspeling St, Bodorp, George 6529 South Africa
3. College of Veterinary Medicine and Biomedical Sciences, Department of Microbiology, Immunology and Pathology, 1601 Campus Delivery, Fort Collins, CO 80523-1601 USA
4. College of Natural Sciences, Department of Statistics, 102 Statistics Building, 851 Oval Dr., Fort Collins, CO 80523-1877 USA
5. College of Veterinary Medicine and Biomedical Sciences, 1601 Campus Delivery, Fort Collins, CO 80523-1601 USA
6. Veterinary Information Network, 777 West Covell Blvd, Davis, CA, 95616 USA