1. Department of Orthopedics and Trauma Surgery, Division of Orthopedics, Medical University of Vienna, 1090 Vienna, Austria
2. Department of Trauma Surgery, University Medical Centre Regensburg, 93053 Regensburg, Germany
3. Department of Orthopedics, University Medical Centre Regensburg, Asklepios Klinikum Bad Abbach, 93077 Bad Abbach, Germany