1. Immunology and Allergology Laboratory Unit, S.Giovanni di Dio Hospital, Azienda USL Toscana Centro, Florence, Italy
2. Rheumatology Unit, S.Giovanni di Dio Hospital, Azienda USL Toscana Centro, Florence, Italy
3. Italian Auxologic Institute, IRCCS, Experimental Laboratory of Immuno Rheumatology, Milan, Italy
4. Department of Clinical Sciences and Community Health, University of Milan, Milan, Italy
5. Inova Diagnostics, INC, San Diego, California, USA