1. Department of Orthopaedic Surgery and Traumatology, Lillebaelt Hospital – University Hospital of Southern Denmark, Kolding;
2. Department of Regional Health Research, University of Southern Denmark, Odense;
3. Orthopaedics Research Unit, Department of Orthopaedic Surgery and Traumatology, Odense University Hospital, Odense;
4. Department of Clinical Epidemiology, Aarhus University Hospital;
5. Department of Clinical Research, University of Southern Denmark, Odense, Denmark