1 Department of Anaesthesia and Intensive Care, Aalborg University Hospital, Aalborg DK-9100, Denmark. Electronic address: bodil.steen.rasmussen@rn.dk.
2 Department of Intensive Care, Copenhagen University Hospital, Copenhagen, Denmark.
3 Copenhagen Trial Unit, Copenhagen University Hospital, Copenhagen, Denmark.
4 Department of Anaesthesia, Copenhagen University Hospital, Copenhagen, Denmark.
5 Department of Anaesthesia and Intensive Care, Aalborg University Hospital, Aalborg DK-9100, Denmark.