[1] Univ Udine, Santa Maria Misericordia Hosp, Med & Biol Sci Dept, Rheumatol Clin, Udine, Italy
[2] AOU, Rheumatol Unit, Monserrato, Italy
[3] Univ Cagliari, Dept Med Sci & Publ Hlth, Monserrato, Italy
[4] Italian Soc Rheumatol, Epidemiol Res Unit, Milan, Italy
[5] Local Hlth Unit ASL Rome 1, Rome & Viterbo 4, Rome, Italy
[6] Osped San Raffaele, IRCCS, UNIRAR Dept, Milan, Italy
[7] Azienda Osped San Carlo, Dipartimento Internist, Potenza, Italy
[8] Dept Internal Med & Therapeut, Pavia, Italy
[9] Univ Ferrara, Dept Med Sci, Cona, Italy
[10] Cent Hosp Bolzano, Rheumatol Unit, Bolzano, Italy
[11] Osped Nuovo Regina Margherita, Dipartimento Specialita Med, Rome, Italy
[12] Osped S Spirito & Nuovo Regina Margherita, UOC Radiol, Rome, Italy
[13] AOU Citta Salute & Sci Torino, Rheumatol Unit, Turin, Italy
[14] IRCCS, Sci Clin Inst Maugeri, Dept Gen Med, Pavia, Italy
[15] ASST Ctr Ortoped Traumatol G Pini CTO, Dipartimento Reumatol & Sci Med, Milan, Italy
[16] Osped Sacro Cuore Negrar, UOS Reumatol, Negrar Di Valpolicella, Italy
[17] Acad Rheumatol Ctr, Dipartimento Sci Clin & Biol, Turin, Italy
[18] Univ Verona, Dept Med, Verona, Italy
[19] Dept Med DIMED, Padua, Italy
[20] Univ Cagliari, Rheumatol Unit, Med Sci & Publ Hlth, Cagliari, Italy