1. Department of Health Promotion, Education and Behavior, Arnold School of Public Health, University of South Carolina, Columbia, SC 29208, USA
2. School of Public Health, Georgia State University, Atlanta, GA 30302, USA
3. Communication Department, University of Massachusetts, Boston, MA 02125, USA
4. Department of Communication, Georgia State University, Atlanta, GA 30302, USA
5. Department of Communication, University of Arizona, Tucson, AZ 85721, USA