[1] Univ Warwick, Warwick Med Sch, Med Stat Stat & Epidemiol Unit, Coventry, W Midlands, England
[2] Univ Western Australia, Nedlands, WA, Australia
[3] Sir Charles Gairdner Hosp, Nedlands, WA, Australia
[4] Univ Oxford, Nuffield Dept Orthopaed Rheumatol & Musculoskelet, Oxford Clin Trials Res Unit, Oxford, England
[5] Univ Oxford, Nuffield Dept Orthopaed Rheumatol & Musculoskelet, Trauma Surg, Oxford, England
[6] Univ Oxford, Nuffield Dept Orthopaed Rheumatol & Musculoskelet, Musculoskeletal Trauma, Oxford, England
[7] Univ Oxford, Nuffield Dept Orthopaed Rheumatol & Musculoskelet, Orthopaed & Trauma Surg, Oxford, England
[8] Univ Oxford, Nuffield Dept Orthopaed Rheumatol & Musculoskelet, Orthopaed Trauma Oxford Trauma, Oxford, England
[9] Unfallkrankenhaus Berlin, Ctr Clin Res, Dept Trauma & Orthopaed Surg, Berlin, Germany