1. Chemical Industry Institute of Toxicology, Research Triangle Park, North Carolina 27709, United States
2. Department of Pathology and Laboratory Medicine, University of Vermont, Burlington, Vermont 05405, United States
3. The Burlington HC Research Group, Inc., Jericho, Vermont 05465, United States
4. Center for Bioorganic Chemistry, RTI International, Research Triangle Park, North Carolina 27709, United States
5. Experimental Pathology Laboratories, Sterling, Virginia 20167, United States
6. Department of Environmental Sciences and Engineering, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27599, United States
7. Environmental Health Science and Research Bureau, Health Canada, Ottawa, Ontario K1A 0K9, Canada