1. University of Kentucky Veterinary Diagnostic Laboratory, Toxicology Laboratory, University of Kentucky , 1490 Bull Lea Rd, Lexington, KY 40511, USA
2. U.S. Food and Drug Administration, Center for Veterinary Medicine , 8401 Muirkirk Rd, Laurel, MD 20708, USA
3. California Animal Health and Food Safety Laboratory System, Toxicology Laboratory, University of California , 620 W Health Science Dr, Davis, CA 95616, USA