[1] L Sacco Univ Hosp, Dept Rheumatol, Rheumatol Unit, I-20157 Milan, Italy
[2] Univ Milan, IRCCS, Osped Maggiore Policlin, Dept Internal Med, Milan, Italy
[3] Maugeri Fdn IRCCS, Res Inst Rehabil Med, Rheumatol & Rehabil Res Unit, Telese Terme, Italy
[4] Univ Padua, Chair Rheumatol, Padua, Italy