1. Department of Anatomy I, University of Cologne, Joseph-Stelzmann Str. 9, 50931 Köln, Germany
2. Clinic for Stereotaxy and Functional Neurosurgery, University of Cologne, Joseph-Stelzmann Str. 9, 50931 Köln, Germany
3. Center for Molecular Medicine (ZMMK), University of Cologne, Joseph-Stelzmann Str. 9, 50931 Köln, Germany