1. Metal Hips Research Group
2. Southampton University, Hospitals NHS Trust, Tremona Road, Southampton SO16 6YD, UK.
3. Joint Replacement Unit, University Hospital of North Tees, Hardwick, Stockton-on-Tees TS19 8PE, UK.
4. Botnar Research Centre, Nuffield Orthopaedic Centre, University of Oxford, Oxford OX3 7LD, UK.