[1] Univ Hosp Policlin Bari, Polyclin Hosp Bari, Inst Cardiovasc Dis, DETO, Bari, Italy
[2] Cardiol Ctr Monzino IRCCS, Milan, Italy
[3] St Anna Sch Adv Studies, Pisa, Italy
[4] Bambino Gesu Pediat Hosp, Rome, Italy
[5] Montreal Heart Inst, Montreal, PQ, Canada
[6] Loyola Univ, Chicago, IL 60611 USA
[7] Univ Hosp Parma, Parma, Italy