1. Davis William R. Pritchard Veterinary Medical Teaching Hospital; University of California; Davis CA USA
2. Department of Veterinary Surgical and Radiological Sciences; University of California; Davis CA USA
3. Department of Small Animal Clinical Sciences; College of Veterinary Medicine, University of Tennessee; Knoxville TN USA
4. Department of Small Animal Clinical Sciences; College of Veterinary Medicine, Michigan State University; East Lansing MI USA
5. Department of Veterinary Pathology, Microbiology and Immunology; University of California; Davis CA USA