1. Department of Physical Medicine, Rehabilitation and Occupational Medicine, Medical University of Vienna, Vienna, Austria;
2. Department of Orthopaedics and Trauma Surgery, Division of Trauma-Surgery, Medical University of Vienna, Vienna, Austria;
3. Department of Orthopedics and Traumatology, LK Baden-Mödling-Hainburg, Baden, Austria;
4. Department of Trauma Surgery and Sports Traumatology, Danube Hospital, Vienna, Austria