Laboratory of Stereotaxy and Interventional Neurosciences, Department of Stereotactic and Functional, Neurosurgery, Medical Center, University of Freiburg, 79106 Freiburg im Breisgau, Germany 3 Department of Stereotactic and Functional Neurosurgery, Medical Center, University of Freiburg, 79106 Freiburg im Bre...