1. Isala Hartcentrum Zwolle the Netherlands
2. Cardiovascular DepartmentUniversity of Trieste Trieste Italy
3. Maasstad Ziekenhuis Rotterdam the Netherlands
4. American Heart of Poland Ustroń Poland
5. Medical University of Silesia Katowice Poland
6. Thoraxcenter, Erasmus Medisch Centrum Rotterdam the Netherlands
7. Medisch Spectrum Twente Enschede the Netherlands
8. Department of CardiologyUniversity and Hospital Fribourg Switzerland
9. Sahlgrenska AcademyUniversity of Gothenburg and Nordic School of Public Health Gothenburg Sweden
10. Department of CardiologyEastern Piedmont University Novara Italy
11. Heart Centre, Academic Medical CentreUniversity Medical Center Amsterdam Amsterdam the Netherlands