1. Wellcome Centre for Integrative Neuroimaging FMRIB Division Nuffield Department of Clinical Neurosciences University of Oxford Oxford United Kingdom
2. Athinoula A. Martinos Center for Biomedical Imaging Massachusetts General Hospital Charlestown Massachusetts
3. Department of Radiology Harvard Medical School Boston Massachusetts
4. Oxford Centre for Clinical Magnetic Resonance Research Division of Cardiovascular Medicine Radcliffe Department of Medicine University of Oxford Oxford United Kingdom
5. Acute Vascular Imaging Centre Division of Cardiovascular Medicine Radcliffe Department of Medicine University of Oxford Oxford United Kingdom
6. Laboratory of Brain and Cognition National Institute of Mental Health Bethesda Maryland
7. Nuffield Department of Surgical Sciences University of Oxford Oxford United Kingdom