1 Centre for Advanced Biomedical Imaging, Division of Medicine, University College London, London, United Kingdom.
2 Centre for Cardiovascular and Metabolic Neuroscience, Department of Neuroscience, Physiology & Pharmacology, University College London, London, United Kingdom.
3 Department of Biomedical and Life Sciences, Lancaster University, Lancaster, United Kingdom.
4 Department of Neurology, National Cerebral and Cardiovascular Center, Suita, Japan.
5 Knight Cardiovascular Institute, Oregon Health & Science University, Portland, OR, United States.
6 Department of Neurology, Jungers Center for Neurosciences Research, Oregon Health & Science University, Portland, OR, United States.