[1] Gaetano Pini Inst, Dept Rheumatol, Milan, Italy
[2] Univ Pavia, Dept Rheumatol, IRCCS Policlin San Matteo Fdn, Pavia, Italy
[3] L Sacco Univ Hosp, Rheumatol Unit, Milan, Italy
[4] Spedali Civil Brescia, Rheumatol & Immunol Unit, Brescia, Italy
[5] Citta Salute & Sci, Dept Rheumatol, Turin, Italy
[6] Osped Mauriziano Umberto 1, Rheumatol Unit, Turin, Italy
[7] ASO SS Antonio & Biagio & C Arrigo, Rheumatol Unit, Alessandria, Italy