1. Department of Clinical Sciences College of Veterinary Medicine, Mississippi State University Mississippi Mississippi 39762 USA
2. School of Veterinary Medicine, College of Medical Veterinary and Life Sciences University of Glasgow Glasgow G61 1QH UK
3. Auburn University College of Veterinary Medicine Auburn AL 36849
4. MSPCA – Angell Animal Medical Center Boston Massachusetts 02130 USA
5. Neurology and Neurosurgery Division San Marco Veterinary Clinics Veggiano Italy
6. Hospital for Small Animals, The Royal (Dick) School of Veterinary Studies University of Edinburgh Midlothian EH25 9RG UK
7. Veterinary Specialty Hospital – San Diego San Diego California 92121 USA