[1] Univ N Carolina, Dept Epidemiol, Chapel Hill, NC 27514 USA
[2] Georgia So Univ, Jiann Ping Hsu Coll Publ Hlth, Dept Epidemiol & Biostat, Statesboro, GA 30460 USA
[3] Univ N Carolina, Sch Med, Dept Med, Chapel Hill, NC 27514 USA
[4] Univ N Carolina, Dept Hlth Policy & Management, Chapel Hill, NC 27514 USA
[5] NYU, Dept Populat Hlth, New York, NY USA
[6] NYU, Dept Med, New York, NY 10016 USA
[7] Univ Mississippi, Dept Med, Jackson, MS 39216 USA