1. Department of Surgical & Radiological Sciences, School of Veterinary Medicine; University of California-Davis; Davis CA USA
2. Department of Pathology, Microbiology & Immunology, School of Medicine; University of South Carolina; Columbia SC USA
3. Rood & Riddle Equine Hospital; Lexington KY USA
4. Veterinary Genetics Laboratory; Department of Population Health and Reproduction; University of California-Davis; Davis CA USA