[1] Sismanogle Gen Hosp, Dept Internal Med 2, Athens 15251, Greece
[2] Patras Univ Hosp, Dept Med, Patras, Greece
[3] Univ Athens, Sch Med, Dept Internal Med 4, GR-11527 Athens, Greece
[4] G Gennimatas Gen Hosp, Intens Care Unit, Thessaloniki, Greece
[5] Univ Thessaly, Sch Med, Dept Med, Larisa, Greece
[6] Univ Athens, Sch Med, Dept Crit Care Med 2, GR-11527 Athens, Greece
[7] Korgialene Benale Gen Hosp, Intens Care Unit, Athens, Greece
[8] Sismanogle Gen Hosp, Dept Pulm Med 3, Athens 15251, Greece