[1] Univ Ioannina, Dept Internal Med, Ioannina, Greece
[2] Hippokrateion Hosp, Cardiol Clin, Athens, Greece
[3] Ahepa Univ Hosp, Dept Propaedeut Internal Med 1, Thessaloniki, Greece
[4] Attikon Univ Hosp, Dept Cardiol, Athens, Greece
[5] Hosp Papageorgiou, Dept Internal Med, Thessaloniki, Greece
[6] Hippocrat Gen Hosp Thessaloniki, Dept Internal Med, Thessaloniki, Greece
[7] Univ Hosp Heraklion, Cardiol Clin, Iraklion, Greece
[8] Onassis Cardiac Surg Ctr, Cardiol Clin, Athens, Greece
[9] Gen Children Hosp Pan & Aglaia Kyriakou, Pediat Clin 2, Athens, Greece