1. Department of Stereotactic and Functional Neurosurgery; Laboratory of Stereotaxy and Interventional Neurosciences; University Freiburg-Medical Center; Breisacher Str. 64 Freiburg 79106 Germany
2. Federal University of Paraná; Hospital de Clínicas; Curitiba Brazil
3. Department of Neurology; University Freiburg-Medical Center; Freiburg Germany
4. Department of Neurology; Lindenbrunn Hospital; Coppenbrügge Germany
5. Department of Neurosurgery; University Hospital of Erlangen; Erlangen Germany