1. Division of General Internal Medicine, Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania
2. Oklahoma Foundation for Medical Quality, Oklahoma City
3. Division of General Internal Medicine, Department of Medicine, University of Pittsburgh School of Medicine, Pittsburgh, Pennsylvania3Veterans Affairs Pittsburgh Healthcare System, Center for Health Equity Research and Promotion, Pittsburgh, Pennsylvania
4. Department of Health Services, Policy and Practice, Brown University, Providence, Rhode Island
5. Colleges of Medicine and Public Health, Oklahoma University Health Sciences Center, Oklahoma City
6. Veterans Affairs Pittsburgh Healthcare System, Center for Health Equity Research and Promotion, Pittsburgh, Pennsylvania6Department of Biostatistics, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania
7. Centers for Medicare & Medicaid Services, Baltimore, Maryland