[1] ANMCO Res Ctr, I-50121 Florence, Italy
[2] Maggiore Hosp, Dept Cardiol, Trieste, Italy
[3] Monaldi Hosp, Dept Cardiol, Naples, Italy
[4] Galliera Hosp, Dept Internal Med, Genoa, Italy
[5] SS Giovanni & Paolo Hosp, Dept Internal Med, Venice, Italy
[6] S Giovanni Persiceto Hosp, Dept Emergency Med, Bologna, Italy
[7] S Maria di Loreto Nuovo Hosp, Dept Internal Med, Naples, Italy
[8] S Paolo Hosp, Dept Cardiol, Savona, Italy
[9] CNR, Ist Fisiol Clin, I-20133 Milan, Italy
[10] Agnelli Hosp, Dept Internal Med, Turin, Italy
[11] Salvatore Maugeri Fdn, Dept Cardiol, Pavia, Italy
[12] Brotzu San Michele Hosp, Dept Cardiol, Cagliari, Italy
[13] IRCCS S Matteo Hosp, Dept Cardiol, Pavia, Italy
[14] Ctr Clin, Rehabil Unit, Naples, Italy