1. Department of Neurosurgery, University Neurosurgical Center Holland, Leiden University Medical Center and Haaglanden Medical Center and Haga Teaching Hospitals, Leiden and The Hague;
2. Department of Neurology, Leiden University Medical Center, Leiden; The Netherlands;
3. Leeds Institute of Medical Research at St. James’s, St. James’s University Hospital, Leeds;
4. Leeds Institute of Health Sciences, Faculty of Medicine and Health, University of Leeds, Leeds, United Kingdom;
5. Department of Neurosurgery, Amsterdam University Medical Centers, location VUmc, Amsterdam; and
6. Department of Neurology, Haaglanden Medical Center, The Hague, The Netherlands