1. University Heart Center Hamburg, Hamburg, Germany
2. Heart Centre, Georg-August University, Göttingen, Germany
3. Department of General and Interventional Cardiology, Heart Center Cologne, Cologne, Germany
4. Department of Cardiology, Deutsches Herzzentrum München, Munich, Germany
5. Heart Centre Brandenburg, Bernau/Berlin, Germany
6. Department of Cardiology, Asklepios Klinik St Georg, Hamburg, Germany
7. FondazioneCardiocentro Ticino, Lugano, Switzerland
8. San Raffaele Hospital,Cardiac Surgery and Interventional Cardiology, Milan, Italy