1 2nd Department of Medicine, Center for Rheumatology, Lower Austria, State Hospital Stockerau, Karl Landsteiner Institute for Clinical Rheumatology, Landstrasse 18, Stockerau, A-2000, Austria
2 Private Rheumatology Office, Babogasse 20, Hollabrunn, A-2020, Austria
3 Department for Rheumatology and Immunology, Medical University of Graz, Auenbruggerplatz 2, Graz, A-8036, Austria