1. University Heart Centre Lübeck, Lübeck, Germany
2. University Heart Centre Lübeck, Lübeck, Germany; Usak University, Faculty of Medicine, Department of Cardiology, Usak, Turkey
3. Division of Cardiology, McGill University Health Centre, Montreal, Canada
4. Department of Cardiac, Thoracic and Vascular Sciences, University of Padua, Padua, Italy