1. Department of Rheumatology, Leiden University Medical Center, Leiden, The Netherlands
2. Department of Radiology, Sheba Medical Center, affiliated with the Tel Aviv University, Tel Aviv, Israel
3. Division of Neuroradiology and Musculoskeletal Radiology, Department of Biomedical Imaging und Image-guided Therapy, Medical University of Vienna/Vienna General Hospital, Vienna, Austria
4. Department of Radiology, Leiden University Medical Center, Leiden, The Netherlands