1. Medical Scientist Training Program, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
2. Division of General Internal Medicine, Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
3. Center for Health Equity Research and Promotion, Veterans Affairs Pittsburgh Health Care System, Pittsburgh, Pennsylvania
4. Department of Biostatistics, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania
5. Center for Research on Health Care, University of Pittsburgh, Pittsburgh, Pennsylvania