1. Clinical Neurosciences, Clinical & Experimental Sciences, Faculty of Medicine University of Southampton Southampton UK
2. Department of Neurosurgery, Wessex Neurological Centre University Hospital Southampton Southampton UK
3. Department of Neurology University Medical Center Utrecht Brain Center, University Medical Center Utrecht Utrecht the Netherlands
4. Stroke Research Centre University College London, Institute of Neurology London UK
5. Department of Neurosurgery Kantonsspital St. Gallen St. Gallen Switzerland