1. Elective Surgery Center Silkeborg Regional Hospital Silkeborg Denmark
2. Department of Clinical Medicine Faculty of Health Aarhus University Aarhus Denmark
3. Department of Anesthesiology Aarhus University Hospital Aarhus Denmark
4. Department of Orthopedic Surgery Viborg Regional Hospital Viborg Denmark
5. Department of Radiology Aarhus University Hospital Aarhus Denmark
6. Department of Orthopedic Surgery Aarhus University Hospital Aarhus Denmark
7. Department of Anesthesiology and Intensive Care Medicine Zealand University Hospital University of Copenhagen Roskilde Denmark