1. Department of Immunology, Genetics and Pathology, University of Uppsala, Sweden.
2. Clinical Epidemiology Division, Department of Medicine Solna, Karolinska Institute, Stockholm, Sweden.
3. Rheumatology Unit, Department of Medicine Solna, Karolinska University Hospital, Karolinska Institute, Stockholm, and Section of Rheumatology, Gastroenterology, Dermatology, Theme Inflammation, Karolinska University Hospital, Stockholm, Sweden.
4. Center for Occupational and Environmental Medicine, Region Stockholm, Stockholm, and Institute of Environmental Medicine, Karolinska Institute, Stockholm, Sweden.
5. Department of Immunology, Genetics and Pathology, University of Uppsala, and Thermo Fisher Scientific, Uppsala, Sweden.
6. Rheumatology Unit, Department of Medicine Solna, Karolinska University Hospital, Karolinska Institute, Stockholm, Sweden.
7. Rheumatology Unit, Department of Medicine Solna, Karolinska University Hospital, Karolinska Institute, Stockholm, Sweden, and Faculty of Medicine, School of Health Sciences, University of Iceland, Reykjavik, Iceland.
8. Department of Immunology, Genetics and Pathology, University of Uppsala, Sweden. johan.ronnelid@igp.uu.se