1. Department of Rheumatology and Inflammation Research, Institute of Medicine, Sahlgrenska Academy at University of Gothenburg, Gothenburg, Sweden
2. Department of Rheumatology, Sahlgrenska University Hospital, Gothenburg, Region Västra Götaland, Sweden
3. Department of Public Health and Clinical Medicine, Rheumatology, Umeå University, Umeå, Sweden
4. Department of Clinical Sciences, Lund University, Malmö and Helsingborg, Sweden
5. Clinical Epidemiology Division, Department of Medicine Solna, Karolinska Institutet, Stockholm, Sweden