1. Centre for Advanced Biomedical Imaging (CABI), University College of London, Paul O'Gorman Building, 72 Huntley Street, London, UK
2. Centre for Tissue and Cell Research, University College of London, Royal National Orthopeadic Hospital, London, UK
3. Department of Mathematics, University College of London, Gower Street, London, UK
4. Institute of Biomedical Engineering, Old Road Campus Research Building, University of Oxford, Oxford, UK