1. Office of Prevention, Pesticides, and Toxic Substances, OPP/BEAD, Environmental Chemistry Laboratory, Building 1105, U.S. Environmental Protection Agency, John C. Stennis Space Center, Mississippi 39529
2. ORD/NCEA, Exposure Analysis and Risk Characterization Group, U.S. Environmental Protection Agency, 1200 Pennsylvania Avenue, NW, Washington, D.C. 20460