1. Unit for Anaesthesiological Investigations, Department of Anaesthesiology, Pharmacology, Intensive Care and Emergency Medicine University Hospitals of Geneva and University of Geneva Geneva Switzerland
2. Division of Anaesthesiology, Department of Anaesthesiology, Pharmacology, Intensive Care and Emergency Medicine University Hospitals of Geneva Geneva Switzerland
3. Department of Medical Physics and Informatics University of Szeged Szeged Hungary
4. Paediatric Anesthesia Unit, Department of Anaesthesiology, Pharmacology, Intensive Care and Emergency Medicine University Hospitals of Geneva Geneva Switzerland