1. Department of Neurosurgery, University of Munich Medical Center, Munich, Germany.
2. Institute for Surgical Research, University of Munich Medical Center, Munich, Germany.
3. Department of Neuroscience, Erasmus Medical Center, Rotterdam, The Netherlands.
4. Max-Planck-Institute for Neurological Research, Cologne, Germany.
5. Department of Neurosurgery, Erasmus Medical Center, Rotterdam, The Netherlands.