1. Department of Clinical Sciences; Cornell University College of Veterinary Medicine; Ithaca New York USA
2. Department of Small Animal Clinical Sciences; College of Veterinary Medicine; The University of Tennessee; Knoxville USA
3. Clinical Science and Services; Royal Veterinary College; University of London; London UK
4. Department of Biomedical and Diagnostic Sciences; The University of Tennessee College of Veterinary Medicine; Knoxville USA