1. Department of Neurology University of GroningenUniversity Medical Center Groningen Groningen The Netherlands
2. Center for Medical Decision Sciences Department of Public Health Erasmus Medical Center Rotterdam The Netherlands
3. Department of Neurology Medisch Spectrum Twente Enschede The Netherlands
4. University Neurosurgical Center Holland (UNCHLeiden University Medical CenterHaaglanden Medical Center & Haga teaching hospitalLeiden & The Hague The Hague The Netherlands
5. Department of Neurology Haaglanden Medical Centre The Hague The Netherlands
6. Department of Neurosurgery Medisch Spectrum Twente Enschede The Netherlands
7. Department of Neurosurgery University Medical Center Groningen Groningen The Netherlands
8. Department of Neurology Isala Hospital Zwolle Zwolle The Netherlands