1. Division of General Internal Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania.
2. Center for Research Health Equity and Promotion, 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 Medical Center, Cleveland, Ohio.