1. Department of Small Animal Medicine and Surgery, College of Veterinary Medicine; University of Georgia; 2200 College Station Road, Athens GA 30605 USA
2. Section of Neurology and Neurosurgery; Red Bank Veterinary Hospital; Tinton Falls NJ USA
3. Section of Anatomic Pathology, Biomedical Sciences, College of Veterinary Medicine; Cornell University; Ithaca NY USA