1. Centre for the Cellular Microenvironment, Department of Biomedical Engineering, Wolfson Centre, University of Strathclyde, Glasgow G4 0NW, U.K.
2. School of Psychology and Neuroscience, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow G12 8QQ, U.K.
3. Scottish Centre for Innovation in Spinal Cord Injury, Queen Elizabeth National Spinal Injuries Unit, Queen Elizabeth University Hospital, Glasgow G51 4TF, U.K.
4. Centre for the Cellular Microenvironment, Institute of Molecular, Cell and Systems Biology, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow G12 8QQ, U.K.
5. Institute of Infection, Immunity and Inflammation, College of Medical, Veterinary and Life Sciences, University of Glasgow, Glasgow G12 8QQ, U.K.
6. Department of Electronic and Electrical Engineering, Royal College Building, University of Strathclyde, Glasgow G1 1XW, U.K.