1. Department of Anesthesiology, Næstved Hospital, Næstved, Denmark
2. Department of Anesthesiology, Bispebjerg and Frederiksberg Hospitals, Copenhagen, Denmark
3. Copenhagen Trial Unit, Centre for Clinical Intervention Research Department, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark
4. Department of Anesthesiology, Zealand University Hospital, Køge, Denmark
5. Department of Cardiology, Holbæk Hospital, Holbæk, Denmark
6. Department of Anesthesia, Gildhoj Private Hospital, Brondby, Denmark
7. Orthopedic Research Unit, Department of Orthopedic Surgery and Traumatology, Odense University Hospital, Odense, Denmark
8. Department of Clinical Research, University of Southern Denmark, Odense, Denmark
9. Department of Orthopedic Surgery, Næstved Hospital, Næstved, Denmark
10. Department of Orthopedics, Nykøbing Falster Hospital, Nykøbing, Denmark
11. Department of Anesthesiology, Nykøbing Falster Hospital, Nykøbing, Denmark
12. Department of Anesthesiology, Holbæk Sygehus, Holbæk, Denmark
13. Department of Orthopedic Surgery, Zealand University Hospital, Køge, Denmark
14. Department of Anesthesiology and Intensive Care, Odense University Hospital, Odense, Denmark
15. Centre of Anaesthesiological Research, Department of Anesthesiology, Zealand University Hospital, Køge, Denmark
16. Department of Clinical Medicine, Faculty of Health and Medical Sciences, Copenhagen University, Copenhagen, Denmark