1. Department of Anesthesiology and Pain Medicine, Harborview Medical Center, University of Washington, Seattle, Washington.
2. Division of Pulmonary and Critical Care Medicine, Harborview Medical Center, University of Washington, Seattle, Washington.
3. Department of Medicine, University of Washington, Seattle, Washington.
4. Institute for Social Research, University of Michigan, Ann Arbor, Michigan.
5. Department of Health Policy and Management, Johns Hopkins Bloomberg School of Public Health, Baltimore, Maryland.
6. Department of Health Services, Policy, and Practice, Brown University School of Public Health, Providence, Rhode Island.
7. Division of Gerontology and Geriatric Medicine, Harborview Medical Center, Seattle, Washington.