1. Department of Epidemiology, School of Public Health, University of Washington, Seattle, Washington, USA
2. Department of Environmental and Occupational Health Sciences, School of Public Health, University of Washington, Seattle, Washington, USA
3. RAND Corporation, Santa Monica, California, USA
4. Department of Internal Medicine, Stanford University School of Medicine, Stanford, California, USA
5. RAND Corporation, Arlington, Virginia, USA
6. Department of Medicine, Stanford Prevention Research Center, Stanford University School of Medicine, Stanford, California, USA
7. Department of Epidemiology, UNC Gillings School of Global Public Health, Chapel Hill, North Carolina, USA
8. Department of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, North Carolina, USA