1. Department of Anesthesiology Næstved‐Slagelse‐Ringsted Hospitals Næstved Denmark
2. Department of Anesthesiology Zealand University Hospital Køge Køge Denmark
3. Department of Regional Health Research The Faculty of Health Sciences University of Southern Denmark Odense Denmark
4. Copenhagen Trial Unit Centre for Clinical Intervention Research Dpt. 7812 Copenhagen University Hospital Copenhagen Denmark
5. Department of Anesthesiology Bispebjerg and Frederiksberg Hospitals Copenhagen Denmark
6. Department of Internal Medicine Holbæk Hospital Holbæk Denmark
7. Department of Anesthesia Gildhoj Private Hospital Brøndby Denmark
8. Department of Anesthesiology and Intensive Care Holbæk Hospital Holbæk Denmark
9. Department of Orthopedic Surgery Holbæk Hospital Holbæk Denmark
10. Orthopedic Research Unit Department of Orthopedic Surgery and Traumatology Odense University Hospital Odense Denmark
11. Department of Clinical Research University of Southern Denmark Odense Denmark