1. Acute Stroke Programme, Radcliffe Department of Medicine, University of Oxford, Oxford, England
2. Department of Surgery and Translational Medicine, University of Milan–Bicocca, Milan, Italy
3. Acute Stroke Programme, Radcliffe Department of Medicine, University of Oxford, Oxford, England3Medical Sciences Division, University of Oxford, Oxford, England4Acute Vascular Imaging Centre, University of Oxford, Oxford University Hospitals, Oxford, Engl