1. Department of Neurosurgery, University of Münster, Münster, Germany
2. Department of Neurosurgery, Ludwig-Maximilians-University Munich, Klinikum Grosshadern, Munich, Germany
3. Asklepios Klinik Nord Heidberg, Hamburg, Germany
4. Department of Neurosurgery, University Regensburg Medical Center, Regensburg, Germany
5. Laser-Research Laboratory, LIFE-Center at University Hospital of Munich, Munich, Germany
6. Department of Clinical Radiology, Universitätsklinikum Münster, Münster, Germany
7. Department of Neuropathology, Universtitätsklinikum Bonn, University of Bonn Medical Center, Bonn, Germany
8. Medac, Gesellschaft für klinische Spezialpräparate mbH, Wedel, Germany