1. School of Community Health Sciences, University of Nevada, Reno, Reno, Nevada, USA
2. Department of Epidemiology, and
3. Department of Environmental Health, Emory University, Atlanta, Georgia, USA
4. Department of Public Health Sciences, University of California, Davis, Davis, California, USA
5. School of Social Ecology,
6. Department of Statistics, and
7. Department of Epidemiology, University of California, Irvine, Irvine, California, USA