[1] Univ Naples 2, Monaldi Hosp, Dept Cardiol, Naples, Italy
[2] Univ Salerno, Dept Cardiol, Salerno, Italy
[3] Boston Childrens Hosp, Dept Cardiol, Boston, MA USA
[4] Harvard Med Sch, Brigham & Womens Hosp, Dept Med, Boston, MA USA
[5] Fdn IRCCS Policlin San Matteo, Cardiol, Pavia, Italy
[6] McGill Univ, Jewish Gen Hosp, Azrieli Heart Ctr, Montreal, PQ, Canada
[7] Free Univ Brussels, Dept Pathophysiol, Brussels, Belgium