[1] Washington Univ, Sch Med, Barnes Jewish Hosp, Dept Orthopaed Surg, St Louis, MO USA
[2] Vanderbilt Univ, Sch Med, Dept Orthopaed Surg & Rehabil, Nashville, TN 37212 USA
[3] Univ Iowa, Sch Med, Dept Orthopaed Surg, Iowa City, IA 52242 USA
[4] Cleveland Clin, Dept Orthopaed Surg, Cleveland, OH 44106 USA
[5] Ohio State Univ, Sch Med, Dept Orthopaed Surg, Columbus, OH 43210 USA
[6] Hosp Special Surg, Sports Med Div, New York, NY 10021 USA
[7] Univ Colorado, Sch Med, Dept Orthopaed Surg, Denver, CO USA
[8] Vanderbilt Univ, Sch Med, Dept Biostat, Nashville, TN 37212 USA