1. Division of Epidemiology, Department of Health Research and Policy, School of Medicine, Stanford University, Stanford, California
2. School of Biological and Population Health Sciences, College of Public Health and Human Sciences, Oregon State University, Corvallis, Oregon
3. Department of Biostatistics, School of Public Health, University of Washington, Seattle, Washington
4. Cardiovascular Health Research Unit and Department of Medicine, School of Medicine, University of Washington, Seattle, Washington
5. Departments of Epidemiology and Health Services, School of Public Health, University of Washington, Seattle, Washington
6. Group Health Research Institute, Group Health Cooperative, Seattle, Washington
7. Department of Epidemiology, Graduate School of Public Health, University of Pittsburgh, Pittsburgh, Pennsylvania