1. Department of Clinical Sciences, Lund University , Lund, Sweden
2. Department of Orthopaedics, Halland Hospital , Halmstad, Sweden
3. Department of Orthopaedics and Sports Medicine, Erasmus University Medical Center Rotterdam , Rotterdam, The Netherlands
4. Department of Orthopaedics, Skåne University Hospital , Lund and Malmö, Sweden
5. Department of General Practice, Erasmus University Medical Center Rotterdam , Rotterdam, The Netherlands