1. Department of Environmental and Occupational Health, Rollins School of Public Health, Emory University, Atlanta, Georgia, USA
2. Department of Chemistry, Emory University, Atlanta, Georgia, USA
3. Department of Health Policy and Management, Johns Hopkins University, Baltimore, Maryland, USA
4. U.S. Environmental Protection Agency, Research Triangle Park, North Carolina, USA
5. Menzie-Cura & Associates, Winchester, Massachusetts, USA
6. Department of Environmental Health, University of California, Berkeley, Berkeley, California, USA