1 Department of Family Medicine, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
2 School of Nursing, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA; Carolina Health Informatics Program, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
3 Department of Family Medicine, School of Medicine, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA; The Cecil G. Sheps Center for Health Services Research, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.