1. Division of Rheumatology, Department of Medicine Solna, Karolinska Institute, Stockholm, Sweden
2. Department of Gastroenterology, Dermatology, Rheumatology, Karolinska University Hospital, Stockholm, Sweden
3. Center for Rheumatology, Academic Specialist Center, Stockholm, Sweden
4. Clinical Epidemiology Division, Department of Medicine Solna, Karolinska Institute, Stockholm, Sweden
5. Faculty of Medicine, School of Health Sciences, University of Iceland, Reykjavik, Iceland
6. Department of Public Health and Caring Sciences, Uppsala University, Uppsala, Sweden