1. University Hospital and University of Zurich Zurich Switzerland
2. Swiss Concussion Center Schulthess Clinic Zurich Switzerland
3. US Soccer Federation Chicago IL USA
4. Departments of Emergency and Orthopedics Feinberg School of Medicine Northwestern University Chicago IL USA
5. The Football Association St George's Park Staffordshire UK
6. Institute of Sports and Preventive Medicine Saarland University Saarbruecken Germany
7. Department of Public Health and Clinical Medicine Umeå University Umeå Sweden
8. School of Sport Sciences UiT The Arctic University of Norway Tromsø Norway
9. University Health Services Princeton University Princeton NJ USA
10. Rutgers‐Robert Wood Johnson Medical School New Brunswick NJ USA
11. Division of Sports Medicine University of Pretoria Pretoria South Africa