[1] Univ Ioannina, Dept Internal Med, Ioannina, Greece
[2] Hippokrateion Hosp, Cardiol Clin, Athens, Greece
[3] Univ Gen Hosp Heraklion, Cardiol Clin, Iraklion, Greece
[4] Natl & Kapodistrian Univ Athens, Attikon Univ Gen Hosp, Dept Cardiol, Athens, Greece
[5] Aristotle Univ Thessaloniki, Ahepa Hosp, Propedeut Dept Internal Med 1, Thessaloniki, Greece
[6] 424 Gen Mil Training Hosp, Dept Internal Med, Thessaloniki, Greece
[7] Natl & Kapodistrian Univ Athens, Gen Childrens Hosp Pan & Aglaia Kyriakou, Dept Pediat B, Pediat Clin, Athens, Greece
[8] Police Med Ctr, Dept Endocrinol, Thessaloniki, Greece
[9] Metropolitan Hosp, Apheresis Unit, Cardiometab Ctr, Lipid Clin, Athens, Greece
[10] Aristotle Univ Thessaloniki, Papageorgiou Gen Hosp Thessaloniki, Dept Internal Med, Thessaloniki, Greece
[11] Aristotle Univ Thessaloniki, Hippokrat Gen Hosp, Dept Internal Med, Thessaloniki, Greece
[12] Tzaneio Gen Hosp, Cardiol Clin, Piraeus, Greece
[13] Goumenissa, Dept Internal Med, Goumenissa, Greece
[14] Natl & Kapodistrian Univ Athens, Attikon Univ Gen Hosp, Dept Pediat, Pediat Clin C, Athens, Greece
[15] Aristotle Univ Thessaloniki, Dept Internal Med, Thessaloniki, Greece