1. RAND Corporation, Arlington, Virginia, USA
2. Division of Biostatistics, School of Public Health, University of Minnesota, Minneapolis, Minnesota, USA
3. RAND Corporation, Santa Monica, California, USA
4. Department of Public Health Sciences, College of Medicine, Penn State University, Hershey, Pennsylvania, USA
5. Department of Medicine, College of Medicine, University of Vermont, Burlington, Vermont, USA
6. Department of Internal Medicine, School of Medicine, University of California at Davis, Sacramento, California, USA
7. Department of Family Medicine and Community Health, Alpert Medical School, Brown University, Providence, Rhode Island, USA
8. Departments of Epidemiology and Medicine, Gillings School of Global Public Health and School of Medicine, University of North Carolina, Chapel Hill, North Carolina, USA