1. Group Health Research Institute; Seattle Washington
2. Department of Epidemiology; University of Washington; Seattle Washington
3. School of Pharmacy; University of Washington; Seattle Washington
4. Center for Clinical Epidemiology and Biostatistics; Department of Biostatistics and Epidemiology; Perelman School of Medicine; University of Pennsylvania; Philadelphia Pennsylvania
5. Division of General Internal Medicine; Department of Medicine; University of Washington; Seattle Washington