1. School of Nursing, Duke University School of Nursing, Durham, North Carolina, USA
2. Samuel DuBois Cook Center on Social Equity, Duke University, Durham, North Carolina, USA
3. Department of Biostatistics & Bioinformatics, Duke University Medical Center, Durham, North Carolina, USA
4. Department of General Internal Medicine, Duke University Medical Center, Durham, North Carolina, USA
5. Department of Obstetrics & Gynecology, Duke University Medical Center, Durham, North Carolina, USA
6. Duke University School of Medicine, Durham, North Carolina,USA