1. Comparative Oncology Program, University of Georgia, College of Veterinary Medicine, Athens, GA 30602, USA
2. Department of Small Animal Medicine and Surgery, University of Georgia, College of Veterinary Medicine, Athens, GA 30602, USA
3. Department of Anatomy and Radiology, University of Georgia, College of Veterinary Medicine, Athens, GA 30602, USA
4. Department of Pathology, University of Georgia, College of Veterinary Medicine, Athens, GA 30602, USA