1. ‘Gr.T.Popa’ University of Medicine and Pharmacy Iasi, Division of Pulmonary Disease, Pulmonary Disease University Hospital, 30 Dr I Cihac Street, 700115 Iasi, Romania ; ;
2. ‘Carol Davila’ University of Medicine and Pharmacy Bucharest, Division of Pulmonary Disease, Institute of Pneumology ‘M Nasta’, 90 Sos.Viilor, Sect 5, 050159, Bucharest, Romania
3. Institute of Pneumology ‘M Nasta’, Bronchology Department, 90 Sos.Viilor, Sect 5, 050159, Bucharest, Romania