1. Curriculum in Toxicology and Environmental Medicine, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27514, United States
2. GSI Environmental Inc., Oakland, California 94612, United States
3. Department of Chemistry, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27514, United States
4. Center for Environmental Medicine, Asthma, and Lung Biology, The University of North Carolina at Chapel Hill, Chapel Hill, North Carolina 27514, United States
5. Public Health and Integrative Toxicology Division, Office of Research and Development, United States Environmental Protection Agency, Chapel Hill, North Carolina 27514, United States