[1] Univ Hosp Leuven, Dept Trauma Surg, Leuven, Belgium
[2] Univ Leuven, Dept Dev & Regenerat, KU Leuven, Leuven, Belgium
[3] Univ Southern Calif, Dept Orthopaed Surg, Keck Sch Med, Los Angeles, CA 90007 USA
[4] Univ Rochester, Dept Orthopaed, Ctr Musculoskeletal Res, Rochester, NY USA
[5] Brigham & Womens Hosp, Dept Orthopaed, 75 Francis St, Boston, MA 02115 USA
[6] Charite Univ Med Berlin, Ctr Musculoskeletal Surg, Berlin, Germany
[7] Humboldt Univ, Freie Univ Berlin, Berlin, Germany
[8] Berlin Inst Hlth, Berlin, Germany
[9] AO Res Inst Davos, Davos, Switzerland