1. Brain Tumor Center Amsterdam at Amsterdam UMC, Vrije Universiteit Amsterdam, Amsterdam, the Netherlands
2. Brain Tumor Center at Erasmus Medical Center Cancer Institute, Rotterdam, the Netherlands
3. Department of Neuro-Oncology, La Pitié Salpêtrière University Hospitals, Sorbonne University, Paris, France
4. Department of Neurology, Haaglanden Medical Center, The Hague, Netherlands
5. Department of Neurology, Leiden University Medical Center, Leiden, the Netherlands
6. Foundation for Epilepsy Institutions in the Netherlands (SEIN), Heemstede, the Netherlands
7. Department of Radiation Therapy, Eugène Marquis Center, Rennes, France
8. Department of Radiation Oncology (MAASTRO), GROW‒School for Oncology and Developmental Biology, Maastricht University Medical Centre, Maastricht, the Netherlands
9. Proton Therapy Center South-East Netherlands (ZON-PTC), Maastricht, the Netherlands
10. Oncology Institute, Rambam Health Care Campus, Haifa, Israel
11. Catalan Institute of Oncology, Hospital Duran i Reynals, L’Hospitalet de Llobregat, Barcelona, Spain
12. European Organisation for Research and Treatment of Cancer (EORTC) Headquarters, Brussels, Belgium
13. Department of Oncology and Clinical Neurosciences, Vaudois University Hospital Center and University of Lausanne, Lausanne, Switzerland
14. Malnati Brain Tumor Institute of the Lurie Comprehensive Cancer Center, Department of Neurological Surgery and Neurology, Northwestern Medicine and Northwestern University, Chicago, Illinois, USA
15. Department of Radiation Oncology, Cantonal Hospital of Graubünden, Chur, Switzerland