1. National Risk Management Research Laboratory, United States Environmental Protection Agency, Research Triangle Park, North Carolina 27711
2. ARCADIS Geraghty & Miller, Inc., 4915 Prospectus Drive, Durham, North Carolina 27713
3. Bureau of Toxic Substance Assessment, New York State Department of Health, Albany, New York 12203
4. Wadsworth Center for Laboratories and Research, New York State Department of Health, Albany, New York 12203