[1] Univ Siena, Dept Med, Rheumatol Unit, Siena, Italy
[2] Azienda Osped Univ Citta Salute & Sci Torino, Rheumatol Unit, Turin, Italy
[3] Univ Florence, Dept Expt & Clin Med, Rheumatol Unit, Florence, Italy
[4] Univ Siena, Resp Dis & Lung Transplantat Unit, Siena, Italy