1. Division of Cardiology, Department of Medicine III University Hospital Frankfurt, Goethe University Frankfurt am Main Germany
2. Department of Cardiothoracic Surgery University Hospital Frankfurt, Goethe University Frankfurt am Main Germany
3. Department of Anesthesiology Intensive Care Medicine and Pain Therapy, University Hospital Frankfurt, Goethe University Frankfurt am Main Germany
4. Department of Anesthesiology University Hospital Wuerzburg Wuerzburg Germany