1. The Centre for Biomedical Engineering, Institute of Orthopaedics, Brockley Hill, Stanmore, Middlesex HA7 4LP, UK.
2. Department of Traumatology and Orthopaedics, University of Turin, Via Zuretti 29, 10126 Turin, Italy.
3. IFM Chemistry Department, University of Turin, Via Giuria 7, 10125 Turin, Italy.
4. School of Mechnical Engineering, University of Leeds, Leeds LS2 9JT, UK.
5. The Royal London Hospital, Whitechapel Road, Whitechapel, London E1 1BB, UK