1. Veterinary Medical Teaching Hospital, and, Davis Dermatology Group, Veterinary Medical Teaching Hospital, University of California, Davis, CA 95616, USA
2. Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California, Davis, CA 95616, and, Davis Dermatology Group, Veterinary Medical Teaching Hospital, University of California, Davis, CA 95616, USA
3. Department of Medicine and Epidemiology, and, Davis Dermatology Group, Veterinary Medical Teaching Hospital, University of California, Davis, CA 95616, USA
4. Department of Pathology, Microbiology and Immunology, School of Veterinary Medicine, University of California, Davis, CA 95616, USA