1. K.L. Maddy Equine Analytical Chemistry Laboratory, School of Veterinary Medicine; University of California; 620 West Health Science Drive Davis CA 95616 USA
2. Department of Veterinary Molecular Biosciences, School of Veterinary Medicine; University of California; One Shields Avenue Davis CA 95616 USA
3. School of Veterinary Medicine; University of California; One Shields Avenue Davis CA 95616 USA
4. California Animal Health and Food Safety Laboratory, School of Veterinary Medicine; University of California; 620 West Health Science Drive Davis CA 95616 USA
5. University of Kentucky Veterinary Diagnostic Laboratory, Department of Veterinary Science; University of Kentucky; 1490 Bull Lea Road Lexington KY 40511 USA
6. LGC Science, Inc.; 1745 Alysheba Way #160 Lexington KY 40509 USA