1. Clinical Cardiology Unit, University Hospital of Cagliari, Italy (L.F., R.M.).
2. ASST Papa Giovanni XXIII Hospital, Cardiovascular Department, Bergamo, Italy (M.G., P.C., A.C., A.G., A.I., G.Q., M.S.).
3. Humanitas Hospital Rozzano, Milano, Italy (G.L.G.).