1. Department of Population Health Sciences, Duke University School of Medicine, and Duke Clinical Research Institute, Duke University, Durham, North Carolina
2. Department of Population Health Sciences, Duke University School of Medicine, Durham, North Carolina
3. Department of Population Health Sciences, Duke University School of Medicine and Duke Clinical Research Institute, Duke University, Durham, North Carolina, and Division of Research, Kaiser Permanente Northern California, Oakland
4. Department of Medicine and Department of Community and Family Medicine, Duke University School of Medicine, Durham, North Carolina
5. Department of Population Health and Department of Anesthesiology, University of Kansas Medical Center, Kansas City