1. Department of Health, Care and Organisation Ostfold University College Østfold Norway
2. Department of Anaesthesia Ostfold Hospital Trust Moss Norway
3. Department of Health and Social Sciences University of Southeastern Norway Norway
4. Institute of Health Sciences, Acute and Critical Care Oslo Metropolitan University Oslo Norway
5. Department of Anaesthesia and Intensive Care Haukeland University Hospital Bergen Norway
6. Institute of Clinical Medicine University of Oslo Oslo Norway
7. Department of Aanesthesia Bærum Hospital Gjettum Norway
8. Department of Anaesthesiology St. Olavs Hospital Trondheim Norway
9. Department of Anaesthesiology Ringerike Hospital Buskerud Norway
10. Department of Anaesthesia Gjøvik Hospital Gjøvik Norway
11. Department of Anaesthesiology Nord University Hospital Tromsø Norway
12. Department of Anaesthesiology Helgelandssykehuset Nordland Norway