1. Health Inequalities Program, Center for Health Policy, Duke University.
2. Department of Community and Family Medicine, Duke University.
3. Duke Global Health Institute, Duke University.
4. Department of Medicine, Division of Infectious Diseases and International Health, Duke University.
5. Terry Sandford Institute of Public Policy, Duke University.
6. Westat, Rockville, Maryland.
7. Department of Medicine, Division of Infectious Diseases, University of Alabama at Birmingham, Birmingham, Alabama.