1. Mehiläinen Medical Centre, Pohjoinen Hesperiankatu 17C, Helsinki, Finland
2. Department of Orthopaedics and Traumatology, Seinäjoki Central Hospital, Hanneksenrinne 7, Seinäjoki, Finland
3. Faculty of Medicine and Life Sciences, University of Tampere, Tampere, Finland
4. Unit of Primary Health Care, Helsinki University Central Hospital, Helsinki, Finland
5. Department of General Practice, University of Helsinki, Helsinki, Finland
6. Unit of Primary Health Care, Kuopio University Hospital, Kuopio, Finland
7. Department of Orthopaedics and Traumatology, Helsinki University Hospital and University of Helsinki, Finland, HUS, Finland