1. Department of Health Promotion, Education, and Behavior, University of South Carolina , 915 Greene Street, Columbia, SC 29208, USA
2. Tasmanian School of Medicine, University of Tasmania , Hobart, Tasmania 7001, Australia
3. Department of Communication, Cornell University , 450 Mann Drive, Ithaca, NY 14853, USA
4. Jeb E. Brooks School of Public Policy, Cornell University , Martha Van Rensselaer Hall, Ithaca, NY 14853, USA
5. Department of Epidemiology and Biostatistics, University of South Carolina , 915 Greene Street, Columbia, SC 29203, USA