1. Department of Cardiology; University of Witten/Herdecke, Katholisches Klinikum Essen, Hülsmannstraße 17; 45355 Essen Germany
2. Department of Cardiology; Cardiovascular Centre, Josef Hospital, Gudrunstr. 56, University of Bochum; Bochum Germany
3. Department of Radiology; University of Witten/Herdecke, Grönemeyer Institut Bochum, Universitätsstraße 142; 44799 Bochum Germany