[1] Univ North Carolina Chapel Hill, Gillings Sch Global Publ Hlth, Dept Epidemiol, Chapel Hill, NC 27599 USA
[2] Univ N Carolina, Injury Prevent Res Ctr, Chapel Hill, NC USA
[3] QuintilesIMS, Real World Insights, Res Triangle Pk, NC USA
[4] Univ North Carolina Chapel Hill, Dept Exercise & Sport Sci, Coll Arts & Sci, Chapel Hill, NC 27599 USA
[5] Univ North Carolina Chapel Hill, Dept Orthopaed, Sch Med, Chapel Hill, NC 27599 USA