1. Department of Rheumatology in Östergötland, and Department of Biomedical and Clinical Sciences, Linköping University, Linköping, Sweden
2. Department of Public Health and Clinical Medicine, Rheumatology, Umeå University, Umeå, Sweden
3. Department of Rheumatology, Falun Hospital, Falun, Sweden
4. Center for Clinical Research Dalarna, Uppsala University, Uppsala, Sweden