1. Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Purdue University, West Lafayette, IN 47907–2026, USA
thompska@purdue.edu
2. Department of Veterinary Clinical Sciences, School of Veterinary Medicine, Purdue University, West Lafayette, IN 47907–2026, USA
3. Department of Medicine, The Bobst Hospital, The Animal Medical Center, 510 E 62nd Street, New York, NY 10021–8302, USA
4. Comparative Pathobiology, School of Veterinary Medicine, Purdue University, West Lafayette, IN 47907–2026, USA
5. Department of Clinical Studies, School of Veterinary Medicine, University of Pennsylvania, Philadelphia, PA 19104–6010, USA