1. The Norwegian Intensive Care and Pandemic Registry (NIPaR), Department of Anesthesia and Intensive Care Haukeland University Hospital Bergen Norway
2. Department of Intensive Care Copenhagen University Hospital, Rigshospitalet Copenhagen Denmark
3. Department of Cardiac Anesthesia and Intensive Care, Heart Hospital Tampere University Hospital Tampere Finland
4. The Finnish Intensive Care Consortium (FICC), Department of Anaesthesia and Critical Care Helsinki University Hospital Espoo Finland
5. The Swedish Perioperative Registry (SPOR), Department of Anaesthesia and Intensive Care Uppsala University Hospital Uppsala Sweden
6. The Swedish Intensive care Registry (SIR), Department of Cardiothoracic Surgery, Anaesthesia and Intensive care; Linköping University Hospital, Linköping and Department of Anaesthesia and Intensive care Vrinnevi Hospital Norrköping Sweden
7. Department of Anaesthesia and Critical Care, Landspitali University Hospital, Faculty of Medicine University of Iceland Reykjavik Iceland
8. Department of Anaesthesia and Critical Care Landspitali University Hospital Reykjavik Iceland
9. Chief Quality Officer The Danish Anaesthesia Database (DAD) Dept. of Quality Improvement Copenhagen University Hospital Copenhagen Denmark
10. The Danish Intensive Care Database (DID), Dept. of Anesthesia and Intensive Care Medicine Aarhus University Hospital Aarhus Denmark