[1] Univ Athens, Dept Internal Med 4, GR-10679 Athens, Greece
[2] Univ Thrace, Dept Internal Med 1, Xanthi, Greece
[3] Red Cross Hosp Athens, Dept Cardiol 1, Athens, Greece
[4] Univ Thessaloniki, Prop Dept Internal Med 2, Thessaloniki, Greece
[5] Univ Athens, Dept Internal Med 2, GR-10679 Athens, Greece