1. Department of Rheumatology; Gaetano Pini Institute; Milan Italy
2. Department of Rheumatology; University of Pavia; IRCCS Policlinico San Matteo Foundation; Pavia Italy
3. Rheumatology and Immunology Unit; University of Brescia, Spedali Civili; Brescia Italy
4. Rheumatology Unit; University of Milan; L. Sacco Hospital; Milan Italy
5. Department of Rheumatology; Azienda Ospedaliero-Universitaria Città della Salute e della Scienza; Torino Italy
6. Rheumatology Unit; Ospedale Mauriziano; Torino Italy