| Affiliation: | 1. Health Services Research & Development, Department of Veterans Affairs Puget Sound Health Care System, Seattle, Washington;2. Department of Epidemiology, School of Public Health, University of Washington, Seattle, Washington;3. Seattle Epidemiologic Research and Information Center, Department of Veterans Affairs Puget Sound Health Care System, Seattle, Washington;4. School of Medicine, University of Washington, Seattle, Washington;5. Department of Biostatistics, School of Public Health, University of Washington, Seattle, Washington;6. Department of Health Services, School of Public Health, University of Washington, Seattle, Washington |
