1. Department of Internal Medicine, Faculty of Medicine, University of Novi Sad, 21000 Novi Sad, Serbia
2. Institute for Pulmonary Diseases of Vojvodina, 21204 Novi Sad, Serbia
3. Faculty of Medicine, University of Novi Sad, 21000 Novi Sad, Serbia
4. Department of Psychology, College of Human Development, 11000 Belgrade, Serbia
5. Department of Pharmacology, Toxicology and Clinical Pharmacology, Faculty of Medicine, University of Novi Sad, 21000 Novi Sad, Serbia