1. Department of Medicine, UNC School of Medicine, Chapel Hill, NC, USA
2. Department of Health Policy and Management, Gillings School of Global Public Health, Chapel Hill, NC, USA
3. Wake Forest University School of Medicine, Winston-Salem, NC, USA
4. Kaiser Permanente Division of Research, Oakland, CA, USA
5. Department of Social Medicine, UNC School of Medicine, Chapel Hill, NC, USA
6. Department of Biostatistical Sciences, Wake Forest University School of Medicine, Winston-Salem, NC, USA
7. Department of Internal Medicine, Ohio State University College of Medicine, Columbus, OH, USA
8. Social Sciences and Health Policy, Wake Forest University School of Medicine, Winston-Salem, NC, USA