1. University of Novi Sad, Faculty of Medicine, 21102 Novi Sad, Serbia
2. Institute for Pulmonary Diseases of Vojvodina, 21204 Sremska Kamenica, Serbia
3. Clinical Center of Vojvodina, 21137 Novi Sad, Serbia
4. Oncology Institute of Vojvodina, 21204 Sremska Kamenica, Serbia
5. Univerity Business Academy in Novi Sad, Faculty of Pharmacy, 21101 Novi Sad, Serbia
6. University of Belgrade, Faculty of Medicine, 11000 Belgrade, Serbia
7. University Clinical Center of Serbia, 11000 Belgrade, Serbia