1 Clinical Division of Rheumatology, Department of Medicine 3, Medical University of Vienna, Währinger Gürtel 18-20, 1090, Vienna, Austria. [email protected].
2 Division of Rheumatology and Immunology, Department of Medicine, Medical University of Graz, Graz, Austria.
3 Division of Neuroradiology and Muskuloskeletal Radiology, Department of Radiology, Medical University of Vienna, Vienna, Austria.
4 Department of Medicine, Medical University of Innsbruck, Innsbruck, Austria.