1. Department of Radiology, Leiden University Medical Center, Leiden, The Netherlands; the Department of Neurosurgery, Leiden University Medical Center, Leiden, The Netherlands
2. Department of Radiology, Leiden University Medical Center, Leiden, The Netherlands
3. the Laboratory for Neuroregeneration, Netherlands Institute for Neuroscience, Amsterdam, The Netherlands
4. the Department of Anesthesiology, Leiden University Medical Center, Leiden, The Netherlands
5. the Department of Neurosurgery, Leiden University Medical Center, Leiden, The Netherlands