1. Department of Orthopaedic Surgery, UPMC Freddie Fu Sports Medicine Center University of Pittsburgh 3200 S. Water St. 15101 Pittsburgh PA USA
2. Department of Molecular Medicine and Surgery, Stockholm Sports Trauma Research Center Karolinska Institutet Stockholm Sweden
3. Capio Artro Clinic FIFA Medical Centre of Excellence Valhallavägen 91 11486 Stockholm Sweden
4. Department of Orthopedic Surgery and Traumatology Kantonsspital Baselland 4101 Bruderholz Switzerland
5. Department of Clinical Research, Research Group Michael T. Hirschmann, Regenerative Medicine and Biomechanics University of Basel 4001 Basel Switzerland
6. Department of Orthopaedics, Institute of Clinical Sciences, Sahlgrenska Academy University of Gothenburg Gothenburg Sweden
7. Department of Orthopedic Surgery Stockholm South Hospital Stockholm Sweden
8. Department of Clinical Science and Education Karolinska Institutet Stockholm Sweden