1. Section of Surgical Pathophysiology; Rigshospitalet; University of Copenhagen; Copenhagen Denmark
2. The Lundbeck Centre for fast-track Hip and Knee Arthroplasty; Copenhagen Denmark
3. Anesthesiological department; Hvidovre Hospital; Copenhagen Denmark
4. Orthopedic department; Holstebro Hospital; Holstebro Denmark
5. Orthopedic department; Vejle Hospital; Vejle Denmark
6. Orthopedic department; Gentofte Hospital; Gentofte Denmark