[1] Univ Hosp Padua, Dept Med, Rheumatol Unit, Padua, Italy
[2] Hosp Bergamo, Dept Internal Med, Bergamo, Italy
[3] Univ Pavia, IRCCS Policlin S Matteo Fdn, Rheumatol Unit, I-27100 Pavia, Italy
[4] San Martino Hosp, Dept Internal Med, Belluno, Italy
[5] Univ Hosp Padua, Blood Transfus Unit, Padua, Italy