1. Department of Cardiology; Charité- Universitätsmedizin Berlin, Campus Virchow-Klinikum; Berlin; Germany
2. Department of Cardiology, Schulich Heart Centre, Sunnybrook Health Sciences Centre; University of Toronto; Toronto; Canada
3. Department of Cardiology and Pneumology, Heart Center; Georg-August-University of Göttingen; Göttingen; Germany