1. Department of Trauma Surgery, University Medical Centre Regensburg, Regensburg, Germany
2. Centre for Clinical Studies, University Medical Centre Regensburg, Regensburg, Germany
3. Sporthopaedicum, Straubing, Germany
4. Department of Trauma-, Hand-, Plastic- and Reconstructive Surgery, University Medical Centre Wuerzburg, Wuerzburg, Germany
5. Department for Sports Injury Prevention, Verwaltungs-Berufsgenossenschaft (VBG), Hamburg, Germany
6. SportdocsFranken, Nuremberg, Germany