1 Division of Critical Care and Emergencies, Oslo University Hospital, Oslo, Norway.
2 Department of Anaesthesiology and Intensive Care, Odense University Hospital, Odense, Denmark.
3 Anestesia and Intensive Care, Karolinska Institute, Stockholm, Sweden.
4 Anesthesia and Intensive Care Medicine, Anesthesiology and Intensive Care Medicine, Umeå University and the University Hospital of Umeå, Umeå Universitet Medicinska fakulteten, Umeå, Sweden.
5 Department of Anaesthesiology, Holbaek Hospital, Holbaek, Denmark.
6 Department of Anaesthesiology and Intensive Care, Tampere University Hospital, Tampere, Finland.
7 Department of Intensive Care, Copenhagen University Hospital Rigshospitalet, Copenhagen, Denmark.
8 Cardiothoracic Anaesthesia & Intensive Care, Sahlgrenska University Hospital, Gothenburg, Sweden.
9 Department of Anaesthesia and Intensive Care, Alingsås Hospital, Alingsås, Sweden.
10 Department of Anaesthesiology, Intensive Care, University of Helsinki and Helsinki University Central Hospital, Emergency Care and Pain Medicine, Helsinki, Finland.
11 Department of Anaesthesiology and Intensive Care, Kuopio University Hospital, Kuopio, Finland.
12 Anaesthesia and Intensive Care, Helse Stavanger HF, Stavanger, Norway.
13 Department of Anaesthesia and Intensive Care, Landspitali University Hospital, Reykjavik, Iceland.
14 Department of Anaesthesiology, Landspitali University Hospital, Reykjavik, Iceland.
15 Department of Anesthesiology, Oslo University Hospital-Rikshospitalet, and University of Oslo, Oslo, Norway.