[1] Univ Athens, Attikon Hosp, Cardiol Dept 2, Rimini 1, Haidari 12462, Greece
[2] Univ Athens, Dept Clin Therapeut, Alexandra Hosp, Vassilisis Sofias Ave 80, Athens 11528, Greece
[3] Aristotle Univ Thessaloniki, Dept Cardiol 1, AHEPA Hosp, Kiriakidi 1, Thessaloniki 54621, Greece
[4] Martin Luther Univ Halle Wittenberg, Midgerman Heart Ctr, Div Cardiol Angiol & Intens Med Care, Dept Internal Med 3,Univ Hosp Halle, Ernst Grube Str 40, D-06120 Halle, Saale, Germany