1. Veterinary Medical Teaching Hospital School of Veterinary Medicine, University of California Davis California USA
2. Department of Biomedical Sciences Ross University School of Veterinary Medicine Basseterre St. Kitts St. Kitts & Nevis
3. Department of Population Medicine and Diagnostic Sciences, Section of Clinical Pathology Cornell University College of Veterinary Medicine Ithaca New York USA
4. Department of Pathology, Microbiology and Immunology School of Veterinary Medicine, University of California Davis California USA