Affiliation: | 1. Centre for Anaesthesiological Research, Department of Anaesthesiology, Zealand University Hospital, Køge, Denmark;2. Department of Anaesthesiology, Næstved-Slagelse-Ringsted Hospitals, Næstved, Denmark Department of Regional Health Research, The Faculty of Health Sciences, University of Southern Denmark, Odense, Denmark;3. Copenhagen Trial Unit, Centre for Clinical Intervention Research, Dpt. 7812, Copenhagen University Hospital, Rigshospitalet, Copenhagen, Denmark;4. Department of Orthopaedic Surgery and Traumatology Orthopedic Research Unit, Odense University Hospital, Odense, Denmark Department of Clinical Research, University of Southern Denmark, Odense, Denmark;5. Centre for Anaesthesiological Research, Department of Anaesthesiology, Zealand University Hospital, Køge, Denmark Department of Clinical Medicine, Copenhagen University, Copenhagen, Denmark |