1. Department of Environmental Sciences and Engineering, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
2. National Center for Advancing Translational Sciences, National Institutes of Health (NIH), Department of Health and Human Services (DHHS), Bethesda, Maryland, USA
3. Bioinformatics Research Center, and
4. Department of Statistics, North Carolina State University, Raleigh, North Carolina, USA
5. Department of Genetics,
6. Department of Psychiatry, and
7. Department of Biostatistics, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA
8. National Center for Environmental Assessment, U.S. Environmental Protection Agency, Washington, DC, USA
9. National Institute of Environmental Health Sciences, NIH, DHHS, Research Triangle Park, North Carolina, USA