1. School of Veterinary Medicine, University of California Davis, Davis, CA, USA
2. Surgical and Radiological Sciences, University of California Davis, Davis, CA, USA
3. William R Pritchard Veterinary Medical Teaching Hospital, School of Veterinary Medicine, University of California, Davis, CA, USA
4. College of Veterinary Medicine, Iowa State University, Ames, IA, USA
5. Veterinary Vision, San Francisco, CA, USA