1. Departments of Surgical and Radiological Sciences, School of Veterinary Medicine, University of California Davis, Davis, CA
2. Department of Neurology, Washington University School of Medicine, St. Louis, MO
3. Pathology, Microbiology, and Immunology, School of Veterinary Medicine, University of California Davis, Davis, CA
4. Medicine and Epidemiology, School of Veterinary Medicine, University of California Davis, Davis, CA
5. Department of Pathology, School of Medicine, University of California San Francisco, San Francisco, CA