[1] Univ Florence, Florence, Italy
[2] Univ Turin, Turin, Italy
[3] Univ Palermo, Palermo, Italy
[4] Azienda Osped Careggi, Florence, Italy
[5] Rheumatol Unit, Florence, Italy
[6] Osped Maggiore, Ircss, Serv Radiol, I-20122 Milan, Italy
[7] Univ Padua, Med Clin 1, Padua, Italy
[8] Univ Verona, Rheumatol Unit, I-37100 Verona, Italy
[9] Univ Pescara, Div Rheumatol, Pescara, Italy