1. Department of Orthopaedics and Traumatology, Tampere University Hospital, Tampere;
2. Department of Anesthesiology, Tampere University Hospital, Tampere;
3. Faculty of Medicine and Health Technology, Tampere University, Tampere;
4. Department of Surgery, Central Finland Hospital District, Jyväskylä;
5. COXA Hospital for Joint Replacement, Tampere, Finland