1. Department of Anesthesiology, University Hospital Zurich, Raemistrasse 100, 8091 Zurich, Switzerland
2. Institute of Anesthesiology and Critical Care Medicine, Clinic Hirslanden Zurich, 8032 Zurich, Switzerland
3. Department of Anesthesiology, Intensive Care, Emergency and Pain Medicine, University Hospital Wuerzburg, University of Wuerzburg, 97070 Wuerzburg, Germany
4. Department of Anesthesiology, Intensive Care Medicine and Pain Therapy, University Hospital Frankfurt, Goethe University Frankfurt, 60629 Frankfurt, Germany
5. Department of Anesthesiology, Intensive Care Medicine and Pain Therapy, Hospital Clinic of Barcelona, University of Barcelona, 08007 Barcelona, Spain