[1] Natl & Kapodistrian Univ Athens, Hippokrat Hosp, Dept Cardiol 1, Athens, Greece
[2] Ohio State Univ, Dept Cardiovasc Med, Columbus, OH 43210 USA
[3] Natl & Kapodistrian Univ Athens, Attikon Hosp, Dept Cardiol 2, Athens, Greece
[4] Yale Univ, Sch Med, Sect Cardiovasc Med, New Haven, CT 06520 USA