[1] Natl & Kapodistrian Univ Athens, Univ Gen Hosp ATTIKON, Sch Med, Dept Cardiol 2, Athens, Greece
[2] Univ Gen Hosp Larissa, Dept Cardiol, Larisa, Greece
[3] Univ Gen Hosp Thessaloniki, Dept Cardiol 1, AHEPA, Thessaloniki, Greece
[4] Democritus Univ Thrace, Sch Med, Dept Cardiol, Alexandroupolis, Greece
[5] Natl & Kapodistrian Univ Athens, Sch Med, Hippokrat Hosp, Dept Cardiol 1, Athens, Greece
[6] Gen Hosp Nikea, Dept Cardiol 2, Piraeus, Greece
[7] Gen Hosp Nikea, Dept Cardiol 1, Piraeus, Greece
[8] Univ Hosp Ioannina, Dept Cardiol 2, Ioannina, Greece
[9] Gen Hosp Athens Evangelismos, Dept Cardiol 2, Athens, Greece
[10] Hippokrat Univ Hosp, Aristotle Univ, Cardiol Dept 3, Thessaloniki, Greece
[11] Thriasio Gen Hosp, Dept Cardiol, Elefsina, Greece
[12] Herakl Univ Hosp, Dept Cardiol, Iraklion, Greece
[13] Patras Univ Hosp, Dept Cardiol, Patras, Greece
[14] Elpis Gen Hosp, Dept Cardiol, Athens, Greece
[15] Univ Athens, Alexandra Hosp, Dept Clin Therapeut, Athens, Greece
[16] Hellen Red Cross Gen Hosp, Dept Cardiol, Athens, Greece