1. Department of Orthopaedics, Traumatology and Hand Surgery, Kuopio University Hospital, Finland
2. Department of Orthopaedics and Traumatology, Helsinki University Hospital, Finland
3. Pihlajalinna Oy, Helsinki, Finland
4. Department of Orthopaedics and Traumatology, Turku University Hospital, Finland
5. Faculty of Social Sciences, University of Tampere, Finland