1. Department of Clinical Studies, Section of SurgeryVeterinary Hospital of the University of Pennsylvania Philadelphia Pennsylvania
2. Department of Clinical Studies, Ontario Veterinary CollegeUniversity of Guelph Guelph Ontario Canada
3. Department of Biostatistics, New Bolton Center, School of Veterinary MedicineUniversity of Pennsylvania Kennett Square Pennsylvania
4. Department of SurgeryUniversity of Pennsylvania School of Medicine Philadelphia Pennsylvania
5. Department of SurgeryGuardian Veterinary Specialists Brewster New York