1. Department of Cardiothoracic Surgery; University Hospital Regensburg; Franz-Josef-Strauss-Allee 11 93042 Regensburg Germany
2. Department of Internal Medicine II; University Hospital Regensburg; Franz-Josef-Strauss-Allee 11 93042 Regensburg Germany
3. Center for Clinical Studies; University Hospital Regensburg; Franz-Josef-Strauss-Allee 11 93042 Regensburg Germany
4. Department of Anesthesiology; University Hospital Regensburg; Franz-Josef-Strauss-Allee 11 93042 Regensburg Germany