1. U.S. Environmental Protection Agency, Office of Pesticide Programs, Biological and Economic Analysis Division, Analytical Chemistry Branch, Environmental Science Center, 701 Mapes Rd, Mail Code 7503C, Rm C209, Fort George G. Meade, MD 20755-5350
2. U.S. Food and Drug Administration, Southeast Regional Laboratory, 60 Eighth St NE, Atlanta, GA 30309
3. U.S. Food and Drug Administration, Center for Food Safety and Applied Nutrition, 5100 Paint Branch Pkwy, College Park, MD 20740-38350
4. U.S. Environmental Protection Agency, Office of Pesticide Programs, Biological and Economic Analysis Division, Analytical Chemistry Branch, 701 Mapes Rd, Fort George G. Meade, MD 20755-5350