[1] Scuola Super Sant Anna, Pisa, Italy
[2] CNR Reg Toscana, Fdn G Monasterio, I-56124 Pisa, Italy
[3] Univ Hosp Paolo Giaccone, Palermo, Italy
[4] Univ Pisa, Cardiac Thorac & Vasc Dept, Pisa, Italy
[5] Univ Pisa, Rheumatol Unit, Pisa, Italy
[6] Univ G DAnnunzio, Inst Cardiol, Chieti, Italy
[7] Univ Messina, Messina, Italy