1. Oncology Institute of Vojvodina, Sremska Kamenica, Serbia
2. Institute for Pulmonary Diseases of Vojvodina, Sremska Kamenica, Serbia + Faculty of Medicine, University of Novi Sad, Novi Sad, Serbia
3. Institute for Pulmonary Diseases of Vojvodina, Sremska Kamenica, Serbia
4. Oncology Institute of Vojvodina, Sremska Kamenica, Serbia + Faculty of Medicine, University of Novi Sad, Novi Sad, Serbia