1. Department of Anaesthesiology, University Hospital RWTH Aachen University, Aachen, Germany
2. Department of Intensive and Intermediate Care, University Hospital RWTH Aachen, Aachen, Germany
3. Department of Thoracic and Cardiovascular Surgery, University Hospital Aachen, Aachen, Germany
4. Department of Medical Technology and Technomathematics, University of Applied Sciences, Aachen, Germany