1. Faculty of Medicine in Novi Sad, University of Novi Sad, Hajduk Veljkova 3, 21137 Novi Sad, Serbia
2. Institute for Pulmonary Diseases of Vojvodina, 21204 Sremska Kamenica, Serbia
3. Clinic of Radiation Oncology, Oncology Institute of Vojvodina, 21204 Sremska Kamenica, Serbia
4. Faculty of Pharmacy, University Business Academy in Novi Sad, Trg Mladenaca 5, 21101 Novi Sad, Serbia
5. Faculty of Medicine, University of Belgrade, 11000 Belgrade, Serbia
6. University Hospital of Pulmonology, Clinical Center of Serbia, 11000 Belgrade, Serbia