1. Departments of Surgical and Radiological Sciences, School of Veterinary Medicine; University of California-Davis; Davis CA 95616
2. Department of Clinical Sciences, College of Veterinary Medicine; Cornell University; Ithaca NY 14853
3. Department of Veterinary Medicine and Surgery; University of Missouri; Columbia MO 65211
4. Department of Veterinary Clinical Sciences, College of Veterinary Medicine; The Ohio State University; Columbus OH 43210