1. Cardiovascular Division, Washington University School of Medicine, St Louis, Missouri
2. Division of General Medicine and Primary Care, Beth Israel Deaconess Medical Center, Boston, Massachusetts
3. Department of Medicine, Harvard Medical School, Boston, Massachusetts
4. Cardiology Section, San Francisco Veterans Affairs Health Care System, San Francisco, California
5. Department of Medicine, University of California, San Francisco
6. Department of Epidemiology and Biostatistics, University of California, San Francisco
7. Cardiovascular Health Research Unit, Departments of Medicine, Epidemiology and Health Services, University of Washington, Seattle
8. Group Health Research Institute, Group Health Cooperative, Seattle, Washington