[1] Maria Eleonora Hosp, Cardiol Unit, Grp Villa Maria Care & Res, Palermo, Italy
[2] Maria Cecilia Hosp, Cardiol Unit, Grp Villa Maria Care & Res, Via Corriera 1, I-48033 Cotignola, Ravenna, Italy
[3] Citta Lecce Hosp, Cardiol Unit, Grp Villa Maria Care & Res, Lecce, Italy
[4] Maria Pia Hosp, Grp Villa Maria Care & Res, Turin, Italy
[5] Anthea Hosp, Grp Villa Maria Care & Res, Bari, Italy
[6] Inst Clin Ligure Alta Specialita, Grp Villa Maria Care & Res, Rapallo, Italy
[7] Univ Brescia, Biostat & Biomath Unit, Brescia, Italy