1. Office of Research; Division of Applied Veterinary Research; Center for Veterinary Medicine; U.S. Food and Drug Administration; Laurel MD USA
2. Office of Research; Division of Residue Chemistry; Center for Veterinary Medicine; U.S. Food and Drug Administration; Laurel MD USA
3. Office of Biostatistics, Division I; Center for Drug Evaluation and Research; U.S. Food and Drug Administration; Silver Spring MD USA