1. Department of Social and Behavioral Sciences, West Virginia University, Morgantown, WV 26506, USA
2. Department of Emergency Medicine, West Virginia University, Morgantown, WV 26506, USA
3. Department of Epidemiology, University of Florida, Gainesville, FL 32611, USA
4. Department of Biostatistics, University of Alabama at Birmingham, Birmingham, AL 35294, USA
5. Department of Family Medicine, West Virginia University, Morgantown, WV 26506, USA