1. Department of Orthopaedic Surgery and Traumatology, and Department of Clinical Research, Orthopaedic Research Laboratory, Odense University Hospital, University of Southern Denmark, Odense, Denmark
2. Department of Orthopaedic Surgery, Vejle Hospital, Vejle, Denmark
3. Department of Clinical Medicine, University of Copenhagen, Copenhagen, Denmark
4. Department of Orthopaedic Surgery & Traumatology, Copenhagen University Hospital, Copenhagen, Denmark