1. William R. Pritchard Veterinary Medical Teaching Hospital; University of California; Davis; CA; USA
2. Department of Medicine and Epidemiology; University of California; Davis; CA; USA
3. Department of Pathology; Microbiology and Immunology; University of California; Davis; CA; USA
4. Department of Clinical Sciences; College of Veterinary Medicine & Center for Comparative Medicine and Translational Research; North Carolina State University; Raleigh; NC; USA
5. Department of Veterinary Medicine; Tokyo University of Agriculture and Technology; 3-5-8 Saiwai-cho; Fuchu; Tokyo; 183-8509; Japan