Affiliation: | 1. College of Veterinary Medicine, University of Georgia, Athens, Georgia, USA;2. Environmental and Radiological Health Sciences, Colorado State University, College of Veterinary Medicine and Biomedical Sciences, Fort Collins, Colorado, USA;3. Department of Veterinary Pathobiology, Texas A & M University, College Station, Texas, USA;4. Damascus Equine Associates, Mount Airy, Maryland, USA |