1. Department of Sport; Exercise and Health; University of Basel; Basel Switzerland
2. Department of Public and Occupational Health; Amsterdam Collaboration on Health and Safety in Sports; VU University Medical Center; Amsterdam Netherlands
3. Medical School Hamburg; Hamburg Germany
4. Swiss Concussion Center (SCC); Schulthess Clinic; Zurich Switzerland
5. Department of Orthopaedics; 1st Faculty of Medicine of Charles University and Hospital Na Bulovce; FIFA - Medical Centre of Excellence; Prague Czech Republic