1. Cambridge Centre for Brain Repair, University of Cambridge, Cambridge CB2 0PY, UK.
2. School of Biological Sciences, King’s College London, London SE1 1UL, UK.
3. School of Systems Engineering, University of Reading, Reading RG6 6AY, UK.
4. Centre for Neuroprosthetics, School of Engineering, Ecole Polytechnique Fédérale de Lausanne, Lausanne CH-1015, Switzerland.
5. Department of Medical Physics and Bioengineering, University College London, London WC1E 6BT, UK.
6. Department of General Surgery, University College London, London WC1E 6BT, UK.