1. Department of Neurology, Leiden University Medical Center, Leiden, the Netherlands
2. Department of Radiology, Leiden University Medical Center, Leiden, the Netherlands
3. Department of Radiology, University Medical Center Utrecht, Utrecht, the Netherlands
4. Department of Neurology, University Medical Center Utrecht, Utrecht, the Netherlands
5. Department of Neurology, St Antonius Hospital, Nieuwegein, the Netherlands
6. Department of Neurology, VU Medical Center, Amsterdam, the Netherlands
7. Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, the Netherlands
8. Julius Center for Health Sciences and Primary Care, University Medical Center Utrecht, Utrecht, the Netherlands