1. Duke University, Department of Population Health Sciences, Durham, NC, USA
2. Duke-Margolis Centerfor Health Policy, Durham, NC, USA
3. Durham VA Health Care System, Durham, NC, USA
4. Division of General Internal Medicine, Department of Medicine, Duke University School of Medicine, Durham, NC, USA
5. Department of Health Services, Policy and Practice, School of Public Health, Brown University, Providence, RI, USA
6. Center for Gerontology and Healthcare Research, School of Public Health, Brown University, Providence, RI, USA
7. Department of Neurology and Department of Psychiatry and Behavioral Sciences, School of Medicine, Duke University, Durham, NC, USA
8. Duke University, Sanford School of Public Policy, Durham, NC, USA