1. European Cyberknife Center Munich Germany
2. Department of Stereotaxy and Functional Neurosurgery, Center for Neurosurgery University Hospital Cologne Cologne Germany
3. Department of Neurosurgery, Ludwig‐Maximilians‐University Munich, Campus Grosshadern Munich Germany
4. German CyberKnife Center Soest Germany
5. CyberKnife Center Mitteldeutschland Erfurt Germany
6. Charité CyberKnife Center, Charité – Universitätsmedizin Berlin Berlin Germany
7. Radiochirurgicum/CyberKnife Südwest Göppingen Germany
8. Department of Otorhinolaryngology and Head and Neck Surgery, Ludwig‐Maximilians‐University Munich, Campus Grosshadern Munich Germany