1. Orthopaedic Department, Southern General Hospital, 1345 Govan Road, Glasgow G51 4TF, UK.
2. Information Services Division, NHS National Services, Scotland, Gyle Square, 1 South Gyle Crescent, Edinburgh EH12 9EB, UK.
3. Queen Margaret Hospital, Whitefield Road, Dunfermline KY12 0SU, UK.
4. Edinburgh New Road Infirmary, 51 Little France Crescent, Edinburgh EH16 4SA, UK