1. Department of Neurosurgery, Ernst-Moritz-Arndt-University Greifswald, Greifswald, Germany
2. Institute for Diagnostic Radiology and Neuroradiology, Ernst-Moritz-Arndt-University Greifswald, Greifswald, Germany
3. Institute of Community Medicine, Ernst-Moritz-Arndt-University Greifswald, Greifswald, Germany