[1] Agcy Prevent & Social Med, Bregenz, Austria
[2] Hanusch Hosp, Vienna Hlth Insurance Fund WGKK, Ludwig Boltzmann Inst Osteol, Vienna, Austria
[3] Hanusch Hosp, Trauma Ctr Meidling, Austrian Workers Compensat Board AUVA, Dept Med 1, Vienna, Austria
[4] Landeskrankenhaus Feldkirch, Dept Trauma Surg, Feldkirch, Austria
[5] Landeskrankenhaus Bregenz, Dept Trauma Surg, Bregenz, Austria
[6] Landeskrankenhaus Hohenems, Dept Trauma Surg, Hohenems, Austria
[7] Landeskrankenhaus Bludenz, Dept Trauma Surg, Bludenz, Austria
[8] Krankenhaus Dornbirn, Dept Trauma Surg, Dornbirn, Austria
[9] Sanat Schruns, Schruns, Austria
[10] Med Univ Innsbruck, Dept Med Stat Informat & Hlth Econ, Innsbruck, Austria
[11] Robert Bosch Krankenhaus, Dept Clin Gerontol, Stuttgart, Germany
[12] Univ Ulm, Inst Epidemiol & Med Biometry, Ulm, Germany