1. Animal
Drugs Research Center, U.S. Food and Drug Administration, Denver
Federal Center, Building 20, Denver, Colorado 80225, United States
2. California
Animal Health and Food Safety Laboratory, University of California at Davis, Davis, California 95616, United States
3. Denver
Laboratory, U.S. Food and Drug Administration, Denver, Colorado 80225, United States
4. Veterinary
Laboratory Investigation and Response Network (Vet-LIRN), Center for
Veterinary Medicine, U.S. Food and Drug Administration, Laurel, Maryland 20708, United States