1. Department of Materials and Tissue, Institute of Orthopaedics and Musculoskeletal Science, University College London, Stanmore, United Kingdom.
2. Department of Cell and Developmental Biology, University College London, London, United Kingdom.
3. Department of Physics and Astronomy, University College London, London, United Kingdom.
4. Northwick Park Institute for Medical Research, Northwick Park Hospital, London, United Kingdom.