1. Karl Landsteiner University of Health Sciences, 3500 Krems, Austria
2. Institute of Medical Radiology, Diagnostics, Intervention, University Hospital St. Pölten, 3100 St. Pölten, Austria
3. Department of Neurosurgery, Universitätsklinikum Erlangen, Friedrich-Alexander University (FAU) Erlangen-Nürnberg, 91054 Erlangen, Germany
4. Division of Neurology, University Hospital St. Pölten, 3100 St. Pölten, Austria
5. Division of Neurosurgery, University Hospital St. Pölten, 3100 St. Pölten, Austria
6. Division of Functional Neurosurgery and Stereotaxy, Friedrich-Alexander University (FAU) Erlangen-Nürnberg, 91054 Erlangen, Germany
7. Department of Scientific Computing, Florida State University, 400 Dirac Science Library Tallahassee, Tallahassee, FL 32306-4120, USA
8. Department of Electrical Engineering and Industrial Informatics, Politehnica University of Timisoara, 300006 Timișoara, Romania
9. Department of Neuroradiology, Universitätsklinikum Erlangen, Friedrich-Alexander University (FAU) Erlangen-Nürnberg, 91054 Erlangen, Germany