1. Faculty of Medicine University of Belgrade Belgrade Serbia
2. Faculty of Medicine, Serbian Academy of Sciences and Arts Belgrade Serbia
3. Heart Failure Unit, Guglielmo da Saliceto Hospital Azienda Unità Sanitaria Locale di Piacenza and University of Parma Piacenza Italy
4. Volgograd Regional Cardiology Centre, Volgograd State Medical University Volgograd Russia
5. Department of Heart Disease Wroclaw Medical University, Centre for Heart Disease, Military Hospital Wroclaw Poland
6. Department of Cardiology Clinical Centre of Serbia Belgrade Serbia
7. Department of Cardiology Reina Sofía Hospital Córdoba Spain
8. Department of Internal Medicine I and Comprehensive Heart Failure Centre University Hospital, University of Würzburg Würzburg Germany
9. Department of Cardiology University of Würzburg Würzburg Germany
10. Division of Cardiology General Hospital Murska Sobota Murska Sobota Slovenia
11. Faculty of Medicine University of Ljubljana Ljubljana Slovenia
12. Department of Cardiovascular Diseases University Hospital Centre Zagreb, University of Zagreb Zagreb Croatia
13. Second Department of Cardiology Attikon University Hospital, Medical School, National and Kapodistrian University of Athens Athens Greece
14. San Raffaele Pisana Scientific Institute Rome Italy