1. Department of Radiology, Leiden University Medical Center, Leiden, The Netherlands
2. Department of Neurology, Leiden University Medical Center, Leiden, The Netherlands
3. Department of Neurology, Elisabeth-TweeSteden Hospital, Tilburg, The Netherlands
4. Department of Neurology, Slingeland Hospital, Doetinchem, The Netherlands
5. Department of Neurology, Alrijne Hospital, Leiderdorp, The Netherlands