1. Centre for Cell Engineering, Institute of Biomedical and Life Sciences, University of Glasgow, Glasgow, UK
2. IRC in Biomedical Materials, Institute of Orthopaedics, Royal National Orthopaedic Hospital Trust, Stanmore, Middlesex, UK
3. IRC in Biomedical Materials, Institute of Orthopaedics, Royal National Orthopaedic Hospital Trust, Stanmore, Middlesex, UK., UK
4. Department of Materials Science and Metallurgy, University of Cambridge, Cambridge, UK