[1] Univ Siena, Dept Cardiovasc Dis, Viale Bracci 1, Siena, Italy
[2] Royal Brompton & Harefield NHS Fdn Trust, Adult Intens Care Unit, London, England
[3] Federico II Univ Hosp Naples, Dept Adv Biomed Sci, Naples, Italy
[4] Univ Milan, Cardiol Univ Dept, IRCCS, Heart Failure Unit,Policlin San Donato, Milan, Italy
[5] Univ Milan, Dept Biomed Sci Hlth, Milan, Italy
[6] Luigi Vanvitelli Univ, Umberto I Hosp Nocera Inferiore Salerno, Div Cardiol, Caserta, Italy
[7] Univ Verona, Dept Med, Div Cardiol, Verona, Italy
[8] Univ Palermo, Univ Hosp P Giaccone, Dept Hlth Promot Sci Maternal Infant Care Interna, Cardiol Unit, Palermo, Italy
[9] Univ Siena, Le Scotte Hosp, Resp Dis & Lung Transplantat Sect, Dept Clin Med & Neurosci, Siena, Italy