1. Department of Communication, University of Maryland, College Park, Maryland, U.S.A
2. Department of Epidemiology and Public Health, Greenebaum Comprehensive Cancer Center, University of Maryland School of Medicine, Baltimore, Maryland, U.S.A
3. Department of Family Science, School of Public Health, University of Maryland, College Park, Maryland, U.S.A
4. Department of Family & Community Medicine, University of Maryland School of Medicine, Baltimore, Maryland, U.S.A