1. Department of Behavioral Social and Health Education Sciences, Emory University Rollins School of Public Health, Atlanta, GA 30322, USA
2. Office of the Regional Administrator, U.S. Environmental Protection Agency, Region 4, Atlanta, GA 30303, USA
3. Department of Environmental and Health Sciences, Spelman College, Atlanta, GA 30314, USA
4. Department of Epidemiology, Emory University Rollins School of Public Health, Atlanta, GA 30322, USA