1. University
of Kentucky Veterinary Diagnostic Laboratory, Toxicology Laboratory, University of Kentucky, Lexington, Kentucky 40511, United States
2. California
Animal Health and Food Safety Laboratory System, Toxicology Laboratory, University of California, Davis, California 95616, United States
3. United
States Food and Drug Administration, Center for Veterinary Medicine, 8401 Muirkirk Road, Laurel, Maryland 20708, United States