1. Anaesthesiology Department, Centre of Head and Orthopaedics, Rigshospitalet and WHO Collaborating Centre for Health Promotion in Hospitals & Health Services, Bispebjerg Hospital,
2. Orthopaedic Clinic, Centre of Head and Orthopaedics, Rigshospitalet. University of Copenhagen
3. Rigshospitalet. University of Copenhagen
4. WHO Collaborating Centre, Bispebjerg Hospital, Copenhagen, Denmark