1. Department of Cardiovascular Engineering Institute of Applied Medical Engineering, Helmholtz Institute, Medical Faculty, RWTH Aachen University Aachen Germany
2. Med. Klinik und Poliklinik II, Heart Center Bonn Bonn Germany
3. Innere Medizin III/Kardiologie Krankenhaus der Barmherzigen Brüder Trier Trier Germany
4. Institute of Applied Medical Engineering, Helmholtz Institute, Medical Faculty, RWTH Aachen University Aachen Germany