1. Department of Clinical Studies, Section of Radiology, University of Pennsylvania School of Veterinary Medicine; Philadelphia PA 19104
2. Department of Molecular Biomedical Sciences, North Carolina State University College of Veterinary Medicine; Raleigh NC 27607
3. William H. Pritchard Veterinary Medical Teaching Hospital; University of California-Davis; Davis CA 95616
4. Department of Surgical and Radiological Sciences; University of California-Davis; Davis CA 95616