1. Center for Global Health, Rockville, Maryland, USA;
2. National Cancer Institute, Rockville, Maryland, USA;
3. Jhpiego, Dar es Salaam, Tanzania;
4. Department of Global Health, Vanderbilt University, Nashville, Tennessee, USA;
5. Departments of Epidemiology, University of Alabama at Birmingham, Birmingham, Alabama, USA
6. Preventive Medicine, University of Alabama at Birmingham, Birmingham, Alabama, USA;
7. Department of Human Sciences, University of Alabama, Tuscaloosa, Alabama, USA
8. Health Behavior, University of Alabama at Birmingham, Birmingham, Alabama, USA;