1. Department of Neurosurgery, University Hospital Leuven, Belgium
2. Department of Experimental Neurosurgery and Neuroanatomy, Catholic University Leuven, Leuven, Belgium
3. Department of Neurosurgery, Sint-Augustinus Hospital Wilrijk, Wilrijk, Belgium
4. Department of Traumatology, University Hospital Leuven, Leuven, Belgium