1. Nuffield Department of Clinical Neurosciences, and
2. Department of Neurosurgery, Oxford University Hospitals NHS Foundation Trust, Oxford;
3. Renishaw plc, Spectroscopy Products Division, Gloucestershire;
4. Nuffield Department of Surgery, University of Oxford, John Radcliffe Hospital, Oxford;
5. FMRIB Centre, Nuffield Department of Clinical Neurosciences, University of Oxford, John Radcliffe Hospital, Oxford, United Kingdom
6. Department of Chemistry, University of Oxford; and