1. Department of Epidemiology and Biostatistics, College of Public Health and Health Professions, University of Florida, Gainesville, Florida, USA;
2. Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania, USA;
3. Environmental Health Program, College of Public Health and Health Professions, University of Florida, Gainesville, Florida, USA;
4. Florida Department of Health, Division of Environmental Health, Tallahassee, Florida, USA