1. Department of Stereotactic and Functional Neurosurgery, University of Freiburg, Freiburg, Germany
2. Faculty of Medicine, University of Freiburg, Freiburg, Germany
3. Department of Functional and Stereotactic Neurosurgery, Brainlab AG, Olof Palme Straße 9, Munich, Germany
4. Department of Neurosurgery, University of Freiburg, Freiburg, Germany
5. Department of Neurology, University of Freiburg, Freiburg, Germany
6. Department of Neuroradiology, University of Freiburg, Freiburg, Germany