1. Department of Anesthesiology, University Medical Center Goettingen, Germany
2. Department of Anesthesiology, University Medical Center Goettingen, Goettingen, Germany
3. Department of Anesthesiology and Intensive Care Medicine, University of Oldenburg, Oldenburg, Germany
4. Department of Cardiothoracic Surgery, Transplantation & Mechanical Support, Royal Brompton & Harefield Hospital, London, United Kingdom
5. Department of Cardiothoracic, Transplant and Vascular Surgery, Hannover Medical School, Hannover, Germany
6. Department of Anesthesiology, Erasmus University/Rotterdam, Rotterdam, Netherlands
7. Department of Anesthesiology, University Medical Center Goettingen, Göttingen, Germany