1. Department of Anaesthesiology, Herlev and Gentofte Hospital University of Copenhagen Denmark
2. Center of Anaesthesiological Research Department of Anaesthesiology Zealand University Hospital Køge Denmark
3. Department of Clinical Medicine University of Copenhagen Denmark
4. Department of Anaesthesiology Næstved‐Slagelse‐Ringsted Hospitals Denmark
5. Department of Regional Health Research The Faculty of Health Sciences University of Southern Denmark Odense Denmark