[1] Univ N Carolina, Injury Prevent Res Ctr, 725 Martin Luther King Blvd, Chapel Hill, NC 27599 USA
[2] Univ N Carolina, Gillings Sch Global Publ Hlth, Dept Hlth Behav, 135 Dauer Dr, Chapel Hill, NC 27599 USA
[3] Univ N Carolina, Gillings Sch Global Publ Hlth, Off Res Innovat & Global Solut, 135 Dauer Dr, Chapel Hill, NC 27599 USA
[4] Univ N Carolina, Sch Med, Dept Allied Hlth Sci, Chapel Hill, NC 27599 USA
[5] Univ N Carolina, Sch Med, Dept Med, Chapel Hill, NC 27599 USA
[6] Univ N Carolina, Cecil G Sheps Hlth Ctr Serv Res, Sch Med, Dept Med, Chapel Hill, NC 27599 USA
[7] Univ N Carolina, Gillings Sch Global Publ Hlth, Dept Epidemiol, 135 Dauer Dr, Chapel Hill, NC 27599 USA
[8] UNC Injury Prevent Res Ctr, 725 Martin Luther King Jr Blvd, Chapel Hill, NC 27599 USA