1 Center for Health Promotion and Disease Prevention, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA; South College, School of Physical Therapy, Knoxville, TN, USA.
2 Department of Health Promotion and Behavior, The University of Georgia College of Public Health, Athens, GA, USA; Department of Health Promotion and Community Health Sciences, Texas A&M School of Public Health, College Station, TX, USA.
3 Center for Health Promotion and Disease Prevention, University of North Carolina at Chapel Hill , Chapel Hill, NC , USA.
4 Department of Health Promotion and Community Health Sciences, Texas A&M School of Public Health , College Station, TX , USA.