1. Rheumatology, Department of Clinical Sciences, Malmö, Lund University, Malmö, Sweden
2. Department of Rheumatology, Skåne University Hospital, Malmö and Lund, Sweden
3. Department of Rheumatology & Inflammation Research, Sahlgrenska Academy, Institute of Medicine, University of Gothenburg, Gothenburg, Sweden
4. Department of Medicine, University of Cambridge, Cambridge, UK
5. Division of Rheumatology, Mayo Clinic College of Medicine and Science, Rochester, MN, USA