1. Department of Electronic and Electrical Engineering, Computer Science and Mathematics, University of Bristol, Bristol BS8 1TH, UK
2. Bristol Neuroscience, Dementia Research Groups, ReMemBr Group, Bristol Medical School (THS), Bristol BS10 5NB, UK
3. Southmead Hospital, North Bristol NHS Trust, Bristol BS10 5NB, UK
4. Department of Computer Science, University of Bristol, Bristol BS8 1TH, UK