1. Department of Anaesthesiology; Medical Faculty; RWTH Aachen University; Aachen Germany
2. Department of Anaesthesiology and Operative Intensive Care Medicine; Charité - Universitätsmedizin Berlin; Berlin Germany
3. Department of Mathematics and Computer Science; Freie Universität Berlin; Berlin Germany
4. Institute of Medical Psychology; Ludwig-Maximilians-Universität München; München Germany
5. SoStAna GmbH and Charité - Universitätsmedizin Berlin; Berlin Germany