1. Department of Epidemiology and Biostatistics, School of Rural Public Health, Texas A&M Health Science Center, College Station, Texas, USA
2. Center for Health Effects of Environmental Contamination, and
3. Department of Epidemiology, College of Public Health, University of Iowa, Iowa City, Iowa, USA
4. Department of Biological and Agricultural Engineering, Texas A&M University, College Station, Texas, USA
5. Department of Health Promotion and Community Health Sciences, School of Rural Public Health, Texas A&M Health Science Center, College Station, Texas, USA
6. Slone Epidemiology Center, Boston University, Boston, Massachusetts, USA
7. III Marine Expeditionary Force, Okinawa, Japan
8. Department of Geography, Texas State University, San Marcos, Texas, USA
9. Texas Department of State Health Services, Austin, Texas, USA