1. Duke University School of Nursing, Durham, NC, USA;
2. Duke Global Health Institute, Duke University, Durham, NC, USA;
3. Department of Community and Family Medicine, Duke University Health System, Durham, NC, USA;
4. Department of Biostatistics and Bioinformatics, Duke University, Durham, NC, USA
5. Division of General Internal Medicine, Department of Medicine, Duke University, Durham, NC, USA
6. Center for Health Services Research in Primary Care, Durham Veterans Affairs Medical Center, Durham NC, USA