1 Stroke Research Group, Institute of Neuroscience, Newcastle University, Newcastle upon Tyne NE2 4AE, UK; Stroke Northumbria, Northumbria Healthcare NHS Foundation Trust, North Tyneside, UK; Newcastle Hospitals NHS Foundation Trust, Newcastle upon Tyne, UK. Electronic address: helen.rodgers@newcastle.ac.uk.
2 Stroke Research Group, Institute of Neuroscience, Newcastle University, Newcastle upon Tyne NE2 4AE, UK.
3 School of Health and Life Sciences, Glasgow Caledonian University, Glasgow, UK.
4 Massachusetts Institute of Technology, Cambridge, MA, USA.