1. Division of Inflammation and Infection/Rheumatology, Department of Biomedical and Clinical Sciences, Linköping University, SE-581 83 Linköping, Sweden
2. Division of Rheumatology, Department of Medicine Solna, Karolinska Institutet, SE-171 77 Stockholm, Sweden
3. Department of Gastroenterology, Dermatology and Rheumatology, Karolinska University Hospital, SE-171 64 Stockholm, Sweden
4. Department of Rheumatology, Faculty of Medicine and Health, Örebro University, SE-701 82 Örebro, Sweden