1. Research and Education, South West London Elective Orthopaedic Centre, Dorking Road, Epsom KT18 7EG, UK.
2. The Royal Infirmary of Edinburgh, 51 Little France Crescent, Old Dalkeith Road, Edinburgh EH16 4SA, UK.
3. The Peripheral Nerve Injury Unit, The Royal National Orthopaedic Hospital, Brockley Hill, Stanmore, Middlesex HA7 4LP, UK.