1. Rheumatology Unit, University of Messina, Messina, Italy
2. Centre for Rheumatic Disease, Kings College London, London, UK
3. Faculty of Medicine, Department of Internal Medicine, Division of Rheumatology, University of Debrecen, Debrecen, Hungary
4. Department of Rheumatology Reade, Amsterdam Rheumatology and Immunology Center, Reade & VU University Medical Center, Amsterdam, The Netherlands