1. Department of Musculoskeletal Diseases, Tampere University Hospital, Tampere, Finland
2. Division of Orthopaedic Surgery, Oslo University Hospital, Oslo, Norway
3. Department of Hand and Microsurgery, Odense University Hospital, Odense, Denmark
4. Department of Hand Surgery, Helsinki University Hospital and University of Helsinki, Helsinki, Finland
5. Department of Hand Surgery, Stockholm University Hospital, Stockholm, Sweden
6. Faculty of Medicine and Health Technology, Tampere University, Tampere, Finland