[1] Aristotle Univ Thessaloniki, George Papanikolaou Hosp, Dept Resp Med, Thessaloniki 57010, Greece
[2] Private Sect, Trikala 42131, Greece
[3] Euromed Gen Clin Thessaloniki, Pulm Clin, Thessaloniki 54645, Greece
[4] Chiesi Hellas SA, Alimos 17455, Greece
[5] BioStatistics PC, Athens 11474, Greece
[6] Natl & Kapodistrian Univ Athens, Univ Dept Resp Med 1, Sotiria Chest Dis Hosp, Med Sch, Athens 11527, Greece
[7] Renou Poggi 1, Alimos 17455, Greece