1. Department of Health Sciences, College of Health and Behavioral Studies, James Madison University, Harrisonburg, Virginia, USA
2. Department of Social and Behavioral Sciences, School of Public Heath, West Virginia University, Morgantown, West Virginia, USA
3. Office of Health Services Research, School of Public Health, West Virginia University, Morgantown, West Virginia, USA
4. Department of Biostatistics, School of Public Health, West Virginia University, Morgantown, West Virginia, USA