[1] Univ Athens, Sch Med, Dept Resp Med 1, Sotiria Hosp Chest Dis, Athens 11634, Greece
[2] Univ Athens, Sch Med, Dept Resp Med 1, Attikon Hosp, Athens 11634, Greece
[3] 401 Gen Army Hosp, Res Unit, Athens, Greece
[4] Sotiria Hosp Chest Dis, Dept Pathol, Athens, Greece
[5] Sotiria Hosp Chest Dis, Cytol Dept, Athens, Greece