[1] Natl & Kapodistrian Univ Athens, Sch Med, Dept Physiol & Pathophysiol, Athens, Greece
[2] Sotiria Gen & Chest Dis Hosp, Resp Med Dept 4, Athens, Greece
[3] Attikon Univ Hosp, Dept Internal Med 4, Athens, Greece
[4] Sotiria Gen & Chest Dis Hosp, Resp Med Dept 10, Athens, Greece
[5] Natl & Kapodistrian Univ Athens, Sch Med, Dept Physiol, Mol & Appl Physiol Unit, Athens, Greece
[6] Sotiria Gen & Chest Dis Hosp, Imaging & Intervent Radiol, Athens, Greece
[7] Athens Naval Hosp, Resp Med Dept, Athens, Greece