1. Department of Medicine, Division of Infectious Diseases and International Health, Health Inequalities Program, Duke University, Durham, North Carolina.
2. Center for Health Policy, Department of Public Policy, Department of Community and Family Medicine, Health Inequalities Program, Duke University, Durham, North Carolina.
3. Department of Psychiatry, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina.
4. Department of Psychiatry and Behavioral Sciences, Duke University, Durham, North Carolina.
5. Institute of Statistics and Decision Sciences, Duke University, Durham, North Carolina.