1. Department of Radiation Oncology; University Medical Center Schleswig-Holstein; Kiel Germany
2. Department of Radiation Oncology; Saphir Radiosurgery Center, Frankfurt am Main & Güstrow; Germany
3. Department of Radiation Oncology; Stanford University; Stanford CA USA
4. Department of Radiation Oncology; University Hospital Cologne; Cologne Germany
5. Bott Cancer Center, Holy Redeemer Hospital; Meadowbrook PA USA
6. Academic Radiation Oncology Department; CLCC Oscar Lambret, & University Lille II; Lille France
7. Department of Radiation Oncology; CyberClinic Cancer Center Spizhenko; Kyiv Ukraine
8. Department of Medical Physics; Hospital Ruber Internacional; Madrid Spain
9. Department of Radiation Oncology; CyberKnife Center Tampa Bay; Tampa Bay FL USA
10. Radiation Therapy Department; Centre Léon Bérard; Lyon France
11. Department of Stereotaxy and Functional Neurosurgery; University Hospital Cologne; Cologne Germany
12. AQUILAB; Loos les Lille France
13. Department of Radiation Oncology; Tuen Mun Hospital; Hong Kong Hong Kong
14. Department of Radiation Oncology; University Hospital Rostock; Rostock Germany
15. Department of Radiation Oncology; University Hospital Copenhagen; Copenhagen Denmark
16. Department of Radiation Oncology; University Hospital Frankfurt; Frankfurt am Main Germany
17. Brain Radiosurgery & CyberKnife Center, Centro Diagnostico Italiano; Milano Italy
18. Institute for Robotic and Cognitive Systems, University of Lübeck; Lübeck Germany