1. Behavioral Sciences and Health Education, Rollins School of Public Health, Emory University, 1518 Clifton Road NE, Atlanta, GA 30322, USA
2. George Warren Brown School of Social Work, Washington University, St Louis, MO, USA
3. Center for Behavioral Epidemiology and Community Health, Graduate School of Public Health, San Diego State University, San Diego, CA, USA
4. School of Public Health, University of Texas Health Sciences Center, Houston, TX, USA
5. University of North Carolina at Chapel Hill Lineberger Comprehensive Cancer Center, Chapel Hill, NC, USA