1. Heart Failure Unit, Cardiac Department; G. da Saliceto Polichirurgico Hospital; Piacenza Italy
2. Fondazione Gabriele Monasterio, CNR; Pisa Italy
3. Department of Cardiology, Fondazione Salvatore Maugeri; IRCCS Scientific Institute of Veruno; Veruno Italy
4. Department of Cardiology, Clinical Center of Serbia; University of Belgrade School of Medicine; Belgrade Serbia
5. Department of Cardiology and Cardiac Rehabilitation; Antwerp University Hospital; Edegem Belgium
6. Department of Social and Welfare Studies; University of Linkoping; Sweden
7. University of Bern; Bern Switzerl
8. Heart Failure Unit at the Department of Cardiology; Athens University Hospital Attikon; Greece
9. Department of Heart Diseases; Wroclaw Medical University; Wroclaw Poland