1. The Lundbeck foundation centre for fast-track hip and knee replacement; Copenhagen University Hospital; Rigshospitalet; Copenhagen Denmark
2. Section for Surgical Pathophysiology; Copenhagen University Hospital; Rigshospitalet; Copenhagen Denmark
3. Department of Orthopedic Surgery; Aalborg University Hospital; Farsø Denmark
4. Department of Orthopedic Surgery; Copenhagen University Hospital Gentofte; Hellerup Denmark
5. Department of Orthopedic Surgery; Vejle Hospital; Vejle Denmark
6. Department of Orthopedic Surgery; Holstebro Regional Hospital; Holstebro Denmark
7. Department of Orthopedic Surgery; Viborg Regional Hospital; Viborg Denmark