[1] Univ Hosp Patras, Dept Cardiol, Patras 26504, Greece
[2] Natl & Kapodistrian Univ Athens, Hippocrat Gen Hosp, Dept Cardiol 1, Athens 15772, Greece
[3] Tzaneio Gen Hosp, Dept Cardiol, Piraeus 18536, Greece
[4] Red Cross Hosp, Dept Cardiol 1, Athens 11526, Greece
[5] Heraklion Univ Hosp, Dept Cardiol, Iraklion 71500, Crete, Greece
[6] Ctr Hospitalier Univ Charleroi, Dept Cardiol, B-6042 Charleroi, Belgium