1. European Cyberknife Center Munich Germany
2. Ludwig‐Maximilians‐Universität München
3. Department of Stereotaxy and Functional Neurosurgery, Center for Neurosurgery, University Hospital Cologne Cologne Germany
4. Department of Neurosurgery Campus Grosshadern, Ludwig‐Maximilians‐University Munich Munich Germany
5. Department of Otorhinolaryngology and Head and Neck Surgery Campus Grosshadern, Ludwig‐Maximilians‐University Munich Munich Germany