1. Cardiology Department of Cardiothoracic Science, University Hospital S. Maria della Misericordia, Udine, Italy
2. Second Cardiology Department, Attikon University Hospital, University of Athens, Athens, Greece
3. Clinic of Heart Diseases, Vilnius University Hospital Santariškių klinikos, Vilnius University, Vilnius, Lithuania
4. Department of Cardiology, Maastricht University Medical Center, Maastricht, The Netherlands
5. University of Birmingham Centre for Cardiovascular Sciences, City Hospital Birmingham, England, UK
6. Department of Cardiology, Institution of Medical Science, Uppsala University, Sweden