1. 1Department of Surgery, Aspetar Orthopaedic and Sports Medicine Hospital, Doha, Qatar
2. 2Department of Orthopaedics, Institute of Clinical Sciences, The Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden
3. 3Department of Clinical Sciences – Orthopedics, Lund University, Lund, Sweden
4. 4The Swedish National Patient Insurance Company, Stockholm, Sweden
5. 5Department of Orthopedics, Hässleholm-Kristianstad Hospitals, Hässleholm, Sweden