1. Rheumatology Unit, Ospedale S. Giovanni di Dio, ASL 10 Florence
2. Rheumatology Unit, IRCCS Salvatore Maugeri, Castel Goffredo, Mantua
3. Biological and Pharmacological Evaluation IRCCS S. Maugeri, Mantua and University of Pavia
4. Immunology and Allergology Laboratory Unit, Ospedale S. Giovanni di Dio, ASL 10 Florence
5. Rheumatology Unit, L. Sacco University Hospital, Milan, Italy