[1] Univ Athens, Sch Med, Dept Resp Med 1, Hosp Dis Chest Sotiria, Athens, Greece
[2] Univ Athens, Athens Med Sch, Attikon Univ Hosp, Pulm Med Dept 2, Athens, Greece
[3] Univ Crete, Sch Med, Dept Thorac Med, Iraklion, Crete, Greece
[4] Univ Crete, Sch Med, Lab Mol & Cellular Pneumonol, Iraklion, Crete, Greece
[5] Hosp Dis Chest Sotiria, Dept Resp Med 7, Athens, Greece
[6] Univ Athens, Athens Med Sch, Attikon Univ Hosp, Dept Thorac Surg, Athens, Greece
[7] Hosp Dis Chest Sotiria, Dept Resp Med 5, Athens, Greece
[8] Univ Thessaly, Sch Med, Dept Resp Med, Larisa, Greece
[9] Corfu Gen Hosp, Resp Med Dept, Corfu, Greece
[10] G Papanikolaou Gen Hosp, Dept Pulm, Thessaloniki, Greece
[11] Aristotle Univ Thessaloniki, Sch Med, Thessaloniki, Greece
[12] Hosp Dis Chest Sotiria, Dept Pathol, Athens, Greece