1. Division of Emergencies and Critical Care, Paediatric Intensive Care Section Oslo University Hospital‐Rikshospitalet Oslo Norway
2. Institute of Clinical Medicine, Faculty of Medicine University of Oslo Oslo Norway
3. Division of Emergencies and Critical Care, Department of Research and Development Oslo University Hospital Oslo Norway
4. Institute of Health Society, Faculty of Medicine University of Oslo Oslo Norway
5. Oslo Center for Biostatistics and Epidemiology, Research Support Services Oslo University Hospital Oslo Norway
6. Division of Emergencies and Critical Care, Department of Anesthesia and Intensive Care medicine Oslo University Hospital‐Rikshospitalet Oslo Norway
7. Department of Intensive Care University of Copenhagen Rigshospitalet Denmark