1. Department of Veterinary Pathobiology, Texas A&M University, College Station, Texas 77843, United States
2. Department of Environmental and Occupational Health, Texas A&M University, College Station, Texas 77843, United States
3. Department of Chemistry, Texas A&M University, College Station, Texas 77843, United States
4. Department of Comparative, Diagnostic & Population Medicine, University of Florida, Gainesville, Florida 32611, United States
5. Department of Atmospheric Sciences, Texas A&M University, College Station, Texas 77843, United States