1. Department of Environmental Sciences and Engineering, University of North Carolina, Chapel Hill, North Carolina, USA
2. National Center for Computational Toxicology, and
3. National Health and Environmental Effects Research Laboratory, Office of Research and Development, U.S. Environmental Protection Agency, Research Triangle Park, North Carolina, USA
4. Lockheed Martin, Research Triangle Park, North Carolina, USA
5. National Center for Advancing Translational Sciences, National Institutes of Health, Department of Health and Human Services, Bethesda, Maryland, USA