1. Department of Orthopedic and Trauma Surgery, Martin-Luther-University Halle-Wittenberg, 06120 Halle, Germany
2. Department of Orthopedic and Trauma Surgery, Josephs-Hospital Warendorf, 48231 Warendorf, Germany
3. Department of Health Sciences, Hybl Sports Medicine and Performance Center, University of Colorado, Colorado Springs, CO 80918, USA
4. Department of Trauma, Reconstructive Surgery and Rehabilitation Medicine, University Medicine Greifswald, Physical and Rehabilitation Medicine, 17475 Greifswald, Germany