1. Department of Environmental and Occupational Health, Texas A&M Health Science Center School of Public Health, College Station, TX, USA;
2. Environmental Epidemiology and Disease Registries Section, Poison Control Program, Texas Department of State Health Services, Austin, TX, USA;
3. Department of Epidemiology & Biostatistics, Texas A&M Health Science Center School of Public Health, College Station, TX, USA;
4. Center for Transportation Safety, Texas A&M Transportation Institute, College Station, TX, USA