1. School of Veterinary Medicine; William R. Pritchard Veterinary Medical Teaching Hospital; University of California-Davis; Davis CA USA
2. Department of Comparative, Diagnostic and Population Medicine; College of Veterinary Medicine; University of Florida; Gainesville FL USA
3. Department of Ophthalmology & Vision Science; School of Medicine; University of California-Davis; Davis CA USA
4. Department of Surgical and Radiological Sciences; School of Veterinary Medicine; University of California-Davis; Davis CA USA
5. Department of Medicine and Epidemiology; School of Veterinary Medicine; University of California-Davis; Davis CA USA