1. Department of Pulmonology Dubrava University Hospital Zagreb Croatia
2. Faculty of Medicine University of Zagreb Zagreb Croatia
3. Faculty of Science University of Zagreb Zagreb Croatia
4. Magdalena Clinic for Cardiovascular Diseases Krapinske Toplice Croatia
5. University North, University Centre Varaždin Varaždin Croatia
6. Clinical Hospital Sveti Duh Zagreb Croatia
7. Department of Pulmonology University Hospital Split Croatia