1 California Animal Health and Food Safety Laboratory, University of California, Davis, 620 West Health Sciences Drive, Davis, California 95616, United States.
2 United States Food and Drug Administration Center for Food Safety and Applied Nutrition, 5100 Paint Branch Parkway, College Park, Maryland 20740, United States.
3 North American Chemical Residue Workshop, 2910 Kerry Forest Parkway, Tallahassee, Florida 32309, United States.