1. Department of Cardiology and Angiology at University Hospital Bergmannsheil Bochum of the Ruhr‐University Bochum Bochum Germany
2. Department of Cardiology and Angiology at Marienhospital Gelsenkirchen Germany
3. Practice for Cardiology and Cardiac Surgery Wuppertal Germany
4. Department of Cardiology Electrophysiology and Angiology Klinikum Luedenscheid Germany
5. University of Witten/Herdecke Witten Germany
6. Department of Internal Medicine at Elisabeth Krankenhaus Bochum of the Ruhr University Bochum Germany