1. Institute for Pulmonary Diseases of Vojvodina, Sremska Kamenica, Serbia
2. Institute for Pulmonary Diseases of Vojvodina, Sremska Kamenica, Serbia + University of Novi Sad, Faculty of Medicine, Novi Sad, Serbia
3. Institute for Pulmonary Diseases of Vojvodina, Sremska Kamenica, Serbia + University of Novi Sad, Faculty of Medicine, Novi Sad, Serbia + College of Vocational Studies for the Education of Preschool Teachers and Sport Trainers, Subotica, Serbia