1. North Hampshire Hospitals, NHS Trust, Aldermaston Road, Basingstoke, Hampshire RG24, 9NA, UK.
2. Warwick Medical School, Clinical Sciences Research Institute, Clifford Bridge Road, Coventry CV2 2DX, UK.
3. Orthopaedic Department, Hôpital de l’Archet, 151 Route, de St Antoine, de Ginestière, 06200 Nice, France.