1. Department of Cardiothoracic and Vascular Surgery, University Hospital of Regensburg, Regensburg, Germany,
2. Department of Cardiothoracic and Vascular Surgery, University Hospital of Regensburg, Regensburg, Germany
3. Department of Hematology and Oncology, University Hospital of Regensburg, Regensburg, Germany
4. Department of Nephrology, Hannover Medical School, Hannover, Germany