1. Departments of Anaesthesia and Intensive Care Biomedical and Clinical Sciences Linköping University Linköping Sweden
2. Department of Anaesthesiology, Intensive Care and Pain Medicine Helsinki University Hospital Helsinki Finland
3. Faculty of Medicine University of Helsinki Helsinki Finland
4. Department of Intensive Care Rigshospitalet, Copenhagen University Hospital Copenhagen Denmark
5. Norwegian Intensive Care and Pandemic Registry Helse Bergen Health Trust Bergen Norway
6. Department of Anaesthesiology and Critical Care Perioperative Services Landspitali – The National University Hospital of Iceland Reykjavik Iceland
7. Department of Research and Development Division of Emergencies and Critical Care Oslo University Hospital Oslo Norway
8. Lovisenberg Diaconal University College Oslo Norway
9. Department of Anaesthesiology and Department of Research and Development Division of Critical Care and Emergencies Oslo University Hospital Oslo Norway
10. Norwegian Intensive Care RegistryHelse Bergen HF Bergen Norway
11. Department of Anesthesia and Intensive Care Haukeland University Hospital Bergen Norway
12. Institute of Clinical Medicine University of Eastern Finland Kuopio Finland
13. Department of Anaesthesiology and Intensive Care Kuopio University Hospital Kuopio Finland
14. Swedish Intensive Care RegistryVärmland County Council Karlstad Sweden
15. Department of Cardiothoracic and Vascular Surgery Linköping University Hospital Linköping Sweden
16. Department of Health, Medicine and Caring Sciences Linköping University Linköping Sweden
17. Faculty of Medicine University of Iceland Reykjavik Iceland