1. Department of Neurosurgery Heinrich Heine University Düsseldorf Germany
2. Department of Radiation Oncology Heinrich Heine University Düsseldorf Germany
3. Department of Neuropathology Heinrich Heine University Düsseldorf Germany
4. Department of Surgery Francisco Marroquin University Guatemala City Guatemala
5. Department of Neurosurgery University Hospital Hamburg‐Eppendorf Hamburg Germany