1. Department of Environmental and Occupational Health, Fay W. Boozman College of Public Health, University of Arkansas for Medical Sciences, Little Rock, AR, USA
2. Department of Biochemistry and Molecular Biology, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, AR, USA
3. Division of Radiation Health, Department of Pharmaceutical Sciences, College of Pharmacy, University of Arkansas for Medical Sciences, Little Rock, AR, USA
4. Department of Biostatistics, College of Medicine, University of Arkansas for Medical Sciences, Little Rock, AR, USA
5. College of Medicine, University of Arkansas for Medical Sciences Northwest, Fayetteville, AR, USA
6. Department of Epidemiology, Fay W. Boozman College of Public Health, University of Arkansas for Medical Sciences, Little Rock, AR, USA