1. School of Pharmacy, University of Washington, Seattle
2. Group Health Research Institute, Seattle, Washington
3. Group Health Research Institute, Seattle, Washington3Department of Epidemiology, University of Washington, Seattle
4. Division of Geriatric Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania
5. Group Health Research Institute, Seattle, Washington5Department of Biostatistics, University of Washington, Seattle6currently with the Department of Biostatistics and Epidemiology, Perelman School of Medicine, University of Pennsylvania, Philadelphia
6. Division of General Internal Medicine, University of Washington, Seattle
7. Group Health Research Institute, Seattle, Washington7Division of General Internal Medicine, University of Washington, Seattle