1. Department of Clinical Sciences, College of Veterinary Medicine Auburn University Auburn Alabama USA
2. Department of Clinical Medicine, Midwestern College of Veterinary Medicine Midwestern University Glendale Arizona USA
3. Department of Pathology and Laboratory Medicine University of Texas Health Science Center at San Antonio, University of Texas San Antonio Texas USA
4. Department of Pathology, Midwestern College of Veterinary Medicine Midwestern University Glendale Arizona USA