1 From the Department of Anaesthesia and Intensive Care, Biomedical and Clinical Sciences, Linköping University, S-58185, Sweden (MSC), Department of Anaesthesia and Intensive Care, Hôpital Bichat-Claude-Bernard, CHU de Paris (DL) and Department of Anaesthesia and Intensive Care, CHU Timone, Aix-Marseille University, France (NB).