1. Department of Orthopaedics and Traumatology, Odense University Hospital, Odense, Denmark.
2. Department of Orthopaedics and Traumatology, Freiburg University Hospital, Freiburg, Germany.
3. Department of Orthopaedic Surgery, Horsens Regional Hospital, Horsens, Denmark
4. Orthopaedic Department, Södersjukhuset, Stockholm, Sweden
5. Division of Orthopaedics, Faculty of Medicine and Health Sciences, Stellenbosch University, Tygerberg Hospital, Cape Town, South Africa
6. Department of Orthopaedic Surgery, Herlev Hospital, Herlev, Denmark
7. Department of Orthopaedic Surgery, Aalborg University Hospital, Aalborg University, Aalborg, Denmark
8. Department of Orthopaedic Surgery, Nottingham University Hospitals, UK
9. Department of Orthopaedic Surgery, Copenhagen University Hospital Hvidovre, Copenhagen, Denmark