1. Department of Rheumatology, Medical University Graz , Graz, Austria
2. Department of Rheumatology, Hospital of Bruneck (ASAA-SABES), Teaching Hospital of the Paracelsus Medical University , Bruneck, Italy
3. Department of Rheumatology and Clinical Immunology, Amsterdam University Medical Center , Amsterdam, The Netherlands
4. Deprtament of Rheumatology, Zuyderland Medical Center , Heerlen, The Netherlands