1. Department of Clinical Studies; Ontario Veterinary College, University of Guelph; Guelph Ontario Canada
2. Department of Surgical and Radiological Sciences; University of California-Davis; Davis California
3. Department of Small Animal Clinical Sciences, College of Veterinary Medicine; University of Florida; Gainesville Florida
4. Department of Clinical Studies; Matthew J. Ryan Veterinary Hospital at the University of Pennsylvania; Philadelphia Pennsylvania
5. Centre Vétérinaire DMV; Montreal Quebec Canada