1Department of Anaesthesiology & Intensive Care, Institution for clinical sciences, Sahlgrenska Academy, Gothenburg, Sweden 2University of Gothenburg/the Sahlgrenska Academy, Institute of Health and care Sciences, and Department of Anaesthesia and Intensive Care, Sahlgrenska University Hospital, Gothenburg, Sweden 3Department of Anaesthesia& Intensive Care, Institution for Clinical Science, Karolinska Institutetat, Danderyds University Hospital, Stockholm, Sweden