1. Department of Sports and Rehabilitation Medicine BG Trauma Hospital of Hamburg Hamburg Germany
2. Spaulding National Running Center Harvard Medical School Cambridge MA USA
3. Department of Sports and Exercise Medicine Institute of Human Movement Science, University of Hamburg Hamburg Germany
4. Institute of Sport Science Friedrich Schiller University Jena Jena Germany
5. Medical School Hamburg Hamburg Germany
6. Schulthess Klinik and Swiss Concussion Center Zürich Switzerland