1. Department of Cardiology, Østfold Hospital Trust, Grålum
2. Department of Rheumatology, Hospital of Southern Norway, Kristiansand, Norway
3. Department of Rheumatology, Southwest Jutland Hospital Esbjerg, Esbjerg, Denmark
4. Department of Diagnostic Imaging, University Children’s Hospital Zurich, Zurich, Switzerland
5. Department of Rheumatology, Martina Hansens Hospital, Bærum
6. Department of Neuromedicine and Movement Science, Faculty of Medicine and Health Sciences, Norwegian University of Science and Technology, Trondheim, Norway
7. Department of Medicine, The Regional Hospital in Horsens, Horsens
8. Department of Clinical Medicine, Aarhus University, Aarhus, Denmark
9. Division of Medicine, Department of Rheumatology, Akershus University Hospital, Oslo, Norway