1. Department of Neurosurgery, University Hospital Bonn, Bonn, Germany
2. Department of Neurosurgery, Paracelsus Hospital Osnabruck, Osnabruck, Germany
3. Department of Radiology, University Hospital Bonn, Bonn, Germany
4. Department of Neuroradiology, University Medical Center Freiburg, Freiburg, Germany
5. Department of Radiology, Evangelische Kliniken Johanniter- und Waldkrankenhaus Bonn gGmbH, Bonn, Germany
6. Department of Nutrition and Food Science, Universität Bonn, Bonn, Germany
7. Department of Neurosurgery, MediClin Robert Janker Hospital, Bonn, Germany