1. Department of Cardiology, Charité – Universitaetsmedizin Berlin, Campus Virchow-Klinikum, Berlin, Germany
2. Cardiovascular Center, St. Josef-Hospital, University Hospital of the Ruhr-University of Bochum, Bochum, Germany
3. Department of Internal Medicine and Cardiology, Charité – Universitaetsmedizin Berlin, Campus Benjamin Franklin, Berlin, Germany
4. Department of Cardiology – Electrophysiology, University Heart Center Hamburg, University Hospital Hamburg-Eppendorf, Hamburg, Germany