1. Department of Sports Science and Clinical Biomechanics, University of Southern Denmark, Odense, Denmark;
2. Lund University, Faculty of Medicine, Department of Clinical Sciences Lund, Orthopedics, Lund, Sweden;
3. Clinical Epidemiology Research and Training Unit, Boston University School of Medicine, Boston, MA, USA
4. Department of Orthopedics and Traumatology, Odense University Hospital, Odense;
5. Department of Orthopedics, Lillebaelt Hospital, Kolding;
6. Department of Orthopedics, Lillebaelt Hospital, Vejle, Denmark;