[1] Santa Croce Hosp, Cardiol Unit, I-10024 Moncalieri, Italy
[2] Royal Brompton & Harefield Hosp, Part Guys & St Thomas NHS Fdn Trust, London SW3 6NP, England
[3] Univ Hosp Zurich, Dept Cardiol, CH-8091 Zurich, Switzerland
[4] Univ Lorraine, Ctr Invest Clin Plurithemat, INSERM, F-54035 Nancy, France
[5] St Bartholomews Hosp, Barts Heart Ctr, Inherited Cardiovasc Dis Unit, London EC1A 7BE, England
[6] Univ Cattolica Sacro Cuore, Dept Cardiovasc & Pulm Sci, I-00168 Rome, Italy
[7] Fdn Policlin Univ A Gemelli IRCCS, Dept Cardiovasc Med, I-00168 Rome, Italy
[8] AO San Camillo Forlanini, Dept Cardiosci, I-00152 Rome, Italy
[9] Galeazzi St Ambrogio Hosp, Med Dept, Cardiol Unit, I-20157 Milan, Italy
[10] Human Gavazzeni, Cardiovasc Dept, I-24125 Bergamo, Italy
[11] San Giovanni Dio Hosp, Cardiol Unit, I-50143 Florence, Italy