1. Department of Orthopaedics and Traumatology, Helsinki University Hospital and University of Helsinki, Helsinki, Finland
2. Department of Orthopaedics and Traumatology, Unit of Musculoskeletal Surgery, Tampere University Hospital, Helsinki, Finland
3. Royal Orthopaedic Hospital, Birmingham, UK
4. Aston University Medical School, Aston University, Birmingham, UK
5. Faculty of Health Science, Aston University, Birmingham, UK