1. Department of Orthopedics and Clinical Sciences, SUS Malmö, Malmö;
2. Sahlgrenska University Hospital, Gothenburg;
3. Department of Clinical Physiology, Kalmar Hospital, Kalmar;
4. Department of Medicine and Health Sciences, Linköping University Hospital, Linköping;
5. Department of Clinical Sciences, Lund, Section of Rheumatology, Lund University, Lund;
6. School of Business, Engineering, and Science, Halmstad University, Halmstad, Sweden.