1. Meyers Primary Care Institute, a joint endeavor of University of Massachusetts Medical School, Fallon Health, and Reliant Medical Group, Worcester, Massachusetts2Division of Geriatric Medicine, University of Massachusetts Medical School, Worcester
2. Division of Research, Kaiser Permanente Northern California, Oakland4Departments of Epidemiology, Biostatistics, and Medicine, University of California, San Francisco
3. Kaiser Permanente Center for Health Research, Portland, Oregon6Department of Public Health and Preventive Medicine, Oregon Health & Science University, Portland