[1] Univ Palermo, Hosp P Giaccone, UOC Cardiol Con Emodinam 2, I-90133 Palermo, Italy
[2] ISMETT, Heart Failure Unit, Palermo, Italy
[3] ARNAS Osped Civ, Dept Cardiol, Palermo, Italy
[4] Maria Eleonora Hosp, Dept Cardiol, Palermo, Italy
[5] Buccheri La Ferla Fatebenefratelli Hosp, Div Cardiol, Palermo, Italy
[6] Fdn Ist S Raffaele G Giglio, Cardiol Unit, Cefalu, Italy