[1] Univ N Carolina, Dept Epidemiol, Chapel Hill, NC 27515 USA
[2] Univ N Carolina, Thurston Arthrit Res Ctr, Chapel Hill, NC 27515 USA
[3] Univ N Carolina, Chapel Hill, NC 27515 USA
[4] Univ N Carolina, Injury Prevent Res Ctr, Chapel Hill, NC 27515 USA
[5] Boston Med Ctr, Boston, MA USA
[6] Univ N Carolina, Dept Radiol, Chapel Hill, NC 27515 USA
[7] Univ N Carolina, Dept Exercise & Sport Sci, Chapel Hill, NC 27515 USA
[8] US Mil Acad, Keller Army Hosp, West Point, NY 10996 USA
[9] Duke Univ, Sch Med, Durham, NC USA
[10] Lund Univ, Fac Med, Dept Clin Sci Lund, Lund, Sweden
[11] Uniformed Serv Univ Hlth Sci, Bethesda, MD USA