1. Department of Anaesthesiology, Intensive Care Medicine and Pain Medicine, University Hospital Münster, Münster, Germany
2. Department of Cardiac Surgery, University of Münster, Münster, Germany
3. Department of Anaesthesiology, Intensive Care Medicine, Palliative and Pain Medicine, University Hospital Bochum, Bochum, Germany
4. Department of Anaesthesiology and Intensive Care Medicine, University Hospital Freiburg, Freiburg, Germany
5. Department of Anaesthesiology and Intensive Care Medicine, University Hospital Tübingen, Tübingen, Germany
6. Institute of Biostatistics and Clinical Research, University of Münster, Münster, Germany
7. Center for Critical Care Nephrology, Department of Critical Care Medicine, University of Pittsburgh, Pittsburgh, Pennsylvania