1. Vårdcentralen Gripen, Karlstad, Sweden
2. Primary Care Research Unit, Centre for Clinical Research, County Council of Värmland, Karlstad, Sweden
3. Department of Orthopaedics, Institute of Clinical Sciences, The Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden
4. Department of Orthopaedics, Sahlgrenska University Hospital, Mölndal, Sweden
5. Akademistatistik–Centre for Applied Biostatistics, Occupational and Environmental Medicine, The Sahlgrenska Academy, University of Gothenburg, Göteborg, Sweden
6. Capio Artro Clinic AB, Stockholm, Sweden
7. Stockholm Sports Trauma Research Center, Karolinska Institutet, Stockholm, Sweden