1. Division of General Internal Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania.
2. Center for Research Health Equity and Promotion, U.S. Department of Veteran's Affairs (VA) Pittsburgh Healthcare System, Pittsburgh, Pennsylvania.
3. Center for Research on Health Care, University of Pittsburgh Center for Research on Health Care, Pittsburgh Pennsylvania.
4. University of Nebraska Medical Center Division of General Internal Medicine, Omaha Nebraska.
5. Case Western Reserve University School of Medicine, Division of General Internal Medicine, Cleveland Ohio.
6. Louis Stokes Cleveland VA Cleveland Healthcare System, Cleveland Ohio.