[1] Univ N Carolina, Sch Med Chapel Hill, Chapel Hill, NC USA
[2] Univ North Carolina Chapel Hill, Dept Social Med, Ctr Hlth Equity Res, Chapel Hill, NC USA
[3] Univ N Carolina, Gillings Sch Global Publ Hlth, Chapel Hill, NC USA
[4] Univ North Carolina Chapel Hill, Dept Surg, Div Cardiothorac Surg, Chapel Hill, NC USA
[5] Duke Univ, Dept Populat Hlth Sci, Durham, NC USA