1. Cardiology and Rhythmology Department, University Hospital St. Josef-Hospital Bochum, Ruhr University Bochum, Gudrunstraße 56, 44791 Bochum, Germany
2. Cardiology and Rhythmology, St.-Johannes Hospital Dortmund, 44137 Dortmund, Germany
3. Department of Internal Medicine I, Division of Cardiology, University Hospital Jena, 07747 Jena, Germany
4. Cardiology Department, Schoen Hospital, 23730 Neustadt in Holstein, Germany