1. Centre for Anaesthesiological Research, Department of Anaesthesiology Zealand University Hospital Køge Denmark
2. Department of Anaesthesiology Juliane Marie Centre ‐ Rigshospitalet Copenhagen Denmark
3. Department of Anaesthesiology Hvidovre Hospital Copenhagen Denmark
4. Copenhagen Trial Unit, Centre for Clinical Intervention Research, Department 7812 Copenhagen University Hospital – Rigshospitalet Copenhagen Denmark
5. Department of Regional Health Research, Faculty of Health Sciences University of Southern Denmark Odense Denmark
6. Department of Clinical Medicine Copenhagen University Copenhagen Denmark