1. Department of Neurology, Academic Medical Centre, Amsterdam, the Netherlands
2. Department of Neurology, Inselspital Hospital University, Bern, Switzerland
3. Department of Vascular Medicine, Academic Medical Centre, Amsterdam, the Netherlands
4. Department of Clinical Epidemiology, Leiden University Medical Centre, Leiden, the Netherlands
5. Department of Neurology, Academic Medical Centre, Amsterdam, the Netherlands5Division of Neuroradiology, Department of Medical Imaging, University Health Network and the University of Toronto, Toronto, Ontario, Canada