1. Department of Pathobiological Sciences, School of Veterinary Medicine, University of Wisconsin–Madison, Madison, WI, USA
2. Department of Surgical Sciences, School of Veterinary Medicine, University of Wisconsin–Madison, Madison, WI, USA
3. Current affiliation: Department of Veterinary Clinical Studies, Royal (Dick) School of Veterinary Studies, University of Edinburgh, Easter Bush Veterinary Centre, Roslin, Midlothian, UK