1. Division of Rheumatology, University of Pavia and IRCCS Policlinico S. Matteo Foundation, Pavia, Italy
2. Division of Rheumatology, University of Padova, Italy
3. Institute of Rheumatology and Affine Sciences, School of Medicine, Catholic University of the Sacred Heart, Rome, Italy
4. Immunorheumatology Research Laboratory, Istituto Auxologico Italiano, Milan, Italy
5. Medical Department, Pfizer Italia, Rome, Italy
6. DETO-Rheumatology Unit, University of Bari, Italy