1. Department of Cardiology and Angiology; Hannover Medical School; Hannover Germany
2. Heart Center; University of Freiburg; Germany
3. Münster University Hospital; Münster Germany
4. Marienhospital Osnabrück; Osnabrück Germany
5. Krankenhaus Mörsenbroich-Rath; Düsseldorf Germany
6. Klinikum Coburg; Coburg Germany