[1] Univ Padua, Dept Cardiac Thorac & Vasc Sci, Padua, 21287, Italy
[2] Johns Hopkins Univ Hosp, Baltimore, MD USA
[3] Univ Bari, Dept Cardiol, Bari, Italy
[4] UCL, Heart Hosp, London, England
[5] Univ Bologna, Dept Cardiol, Biologna, 02111, Italy
[6] Tufts Univ New England Med Ctr, Boston, MA 02111 USA
[7] Tufts Univ, Sch Med, Boston, MA USA
[8] San Filippo Neri Hosp, Rome, Italy
[9] Univ Padua, Inst Pathol Anat, Padua, Italy