1. Faculty of Medicine University of Novi Sad Novi Sad Serbia
2. Institute of Cardiovascular Diseases Vojvodina Sremska Kamenica Serbia
3. Faculty of Phylosophy University of Novi Sad Novi Sad Serbia
4. Clinical Center of Vojvodina Novi Sad Serbia
5. Institute for Pulmonary Diseases Vojvodina Sremska Kamenica Serbia