1. Department of Surgical and Radiological Sciences; School of Veterinary Medicine; University of California-Davis; Davis CA 95616 USA
2. Department of Clinical Studies; School of Veterinary Medicine; University of Pennsylvania; Philadelphia PA 19104 USA
3. Department of Small Animal Clinical Sciences; College of Veterinary Medicine; Michigan State University; East Lansing MI 48824 USA
4. Department of Population Health and Reproduction; School of Veterinary Medicine; University of California- Davis; Davis CA 95616 USA
5. Koret School of Veterinary Medicine; Hebrew University of Jerusalem; Rehovot 7610001 Israel