1. Department of General and Interventional Cardiology; University Heart Centre; Hamburg Germany
2. St. Antonius Hospital; Nieuwegein The Netherlands
3. Heart Centre; Georg-August University; Göttingen Germany
4. Heart Centre Brandenburg; Bernau/Berlin Germany
5. Department of Cardiology; University RWTH Aachen; Aachen Germany
6. Cardiovascular Centre; University Hospital; Zurich Switzerland
7. Fondazione Cardiocentro Ticino; Lugano Switzerland
8. Department of Medical Biometry and Epidemiology; University Medical Centre Hamburg-Eppendorf; Hamburg Germany
9. Department of Cardiovascular Surgery; University Heart Centre; Hamburg Germany