1. William R. Pritchard Veterinary Medical Teaching Hospital; University of California; Davis CA USA
2. Department of Medicine and Epidemiology; School of Veterinary Medicine; University of California; Davis CA USA
3. Department of Population Health and Reproduction; School of Veterinary Medicine; University of California; Davis CA USA
4. Kenneth L. Maddy Equine Analytical Chemistry Laboratory; School of Veterinary Medicine; University of California; Davis CA USA