1. Heart Institute Hospital Universitari Germans Trias i Pujol, CIBERCV Barcelona Spain
2. Cardiology Clinic, University Medical Center Medical Faculty University of Belgrade Belgrade Serbia
3. Medical Faculty University of Belgrade University Clinical Hospital Center Bezanijska kosa Belgrade Serbia
4. Cardiology Clinic, Institute for Cardiovascular Diseases of Vojvodina Medical Faculty University of Novi Sad Novi Sad Serbia
5. Department of Cardiology University Clinical Hospital Center ‘Dr Dragisa Misovic‐Dedinje’ Belgrade Serbia
6. Clinic for Cardiovascular Diseases, University Clinical Centre of the Republic of Srpska, Medical Faculty University of Banja Luka Banja Luka Bosnia and Herzegovina
7. Clinic for Internal Medicine General Hospital Užice Užice Serbia
8. Department of Cardiovascular Medicine, Clinical Hospital Center Split University of Split Faculty of Medicine Split Croatia
9. University Clinic of Cardiology Skopje Macedonia
10. Medical Faculty University ‘Ss Cyril and Methodius’ Skopje Macedonia
11. Cardiology Clinic, Clinical Center Podgorica School of Medicine University of Podgorica Podgorica Montenegro
12. University of Zagreb School of Medicine, Department of Cardiovascular Diseases University Hospital Center Zagreb Zagreb Croatia
13. Clinic for Cardiovascular diseases University Hospital Center Sestre milosrdnice Zagreb Croatia
14. Department for Cardiovascular Diseases, School of Medicine, Clinical Hospital Center Sveti Duh University of Zagreb Zagreb Croatia
15. Medical School and University Clinical Centre Tuzla Tuzla Bosnia and Herzegovina
16. Department of Internal Medicine II, Division of Cardiology Medical University of Vienna Vienna Austria
17. Department of Cardiology, University Medical Center Groningen University of Groningen Groningen Netherlands
18. Department of Cardiology, Department of Medical and Surgical Specialties, Radiological Sciences, and Public Health, ASST Spedali Civili University of Brescia Brescia Italy
19. IRCCS San Raffaele Pisana Rome Italy
20. Medical Faculty University of Belgrade, Serbian Academy of Sciences and Arts University Medical Center Belgrade Serbia