1. Centre for Pathophysiology of Breathing and Sleep Medicine, The Institute for Pulmonary Diseases of Vojvodina, Faculty of Medicine; University of Novi Sad; Novi Sad Serbia
2. Department for Chronic Obstructive Pulmonary Disease, The Institute for Pulmonary Diseases of Vojvodina, Faculty of Medicine; University of Novi Sad; Novi Sad Serbia
3. Department for Sarcoidosis and Diffuse Pulmonary Diseases, The Institute for Pulmonary Diseases of Vojvodina, Faculty of Medicine; University of Novi Sad; Novi Sad Serbia
4. Polyclinic, The Institute for Pulmonary Diseases of Vojvodina, Faculty of Medicine; University of Novi Sad; Novi Sad Serbia