1. Department of Cardiology, West-German Heart and Vascular Center Essen and University Duisburg-Essen, Germany
2. University of Insubria, Varese, Italy
3. Department of Thoracic and Cardiovascular surgery, West-German Heart and Vascular Center Essen and University Duisburg-Essen, Germany
4. Department of Radiology, University Hospital Essen and University Duisburg-Essen, Germany
5. Cardioangiological Center Bethanien, Germany
6. ‘Heart’ Department, University Hospital Salerno, Italy