1. Department of Medicine-Cardiology; University Medical Centre; Mannheim Germany
2. Clinical Centre of Serbia Institute for Cardiovascular Diseases; Belgrade Serbia
3. Herz-Zentrum-Bodensee; Konstanz Germany
4. Southampton University Hospital; UK
5. Department of Cardiology; Georg-August-Universität; Heart Centre Göttingen Göttingen Germany
6. Hôpital Laval; Quebec Canada
7. University of Maryland School of Medicine; Baltimore Maryland USA
8. Medtronic Inc; Mounds View; Minnesota USA
9. King's College Hospital; London UK