1. AHEPA University Hospital; Thessaloniki Greece
2. Heart Centre Friesland; Medisch Centrum Leeuwarden; Leeuwarden The Netherlands
3. Policlinico San Donato; Milan Italy
4. Cliniques Universitaires Saint-Luc; Brussels Belgium
5. Royal Victoria Hospital; Belfast United Kingdom
6. Cedars Sinai Heart Institute; Los Angeles California
7. Kerckhoff Heart and Thorax Center; Bad Nauheim Germany
8. Quebec Heart and Lung Institute; Laval University; Quebec City Quebec Canada
9. University Heart Center Hamburg; Hamburg Germany
10. Karolinska University Hopital; Karolinska Institutet; Stockholm Sweden
11. Hygeia Hospital; Athens Greece
12. Royal Adelaide Hospital; University of Adelaide; Adelaide Australia
13. The Heart Center; Rigshospitalet; Copenhagen Denmark