1. Department of Neurosurgery, University Hospital Erlangen, 91054 Erlangen, Germany
2. Department of Neurosurgery, University Hospital Halle (Saale), 06120 Halle (Saale), Germany
3. Department of Neuroradiology, University Hospital Erlangen, 91054 Erlangen, Germany
4. Epilepsy Center, Department of Neurology, University Hospital Erlangen, 91054 Erlangen, Germany