1. Department for Internal Medicine II, Cardiology, Medical University of Vienna , Vienna , Austria
2. Department of Cardiac Surgery, Medical University of Vienna , Vienna , Austria
3. Department of Cardiovascular, Cardiac, Thoracic and Vascular Anesthesia and Intensive Care, Medical University of Vienna , Vienna , Austria
4. Clinic for General and Interventional Cardiology/Angiology, Herz- und Diabeteszentrum NRW, Ruhr-Universität Bochum , Bad Oeynhausen , Germany