1. Department of Radiation Oncology, Klinikum rechts der Isar, Technical University of Munich (TUM), Munich, Germany
2. Institute for Radiation Medicine (IRM), Helmholtz Zentrum München, Neuherberg, Germany
3. Department of Radiation Oncology, University of Washington, Seattle
4. Department of Radiation Oncology, Sunnybrook Odette Cancer Centre, University of Toronto, Toronto, Ontario, Canada
5. Department of Radiation Oncology, Princess Alexandra Hospital, Brisbane, Queensland, Australia
6. Department of Radiation Oncology, University of Queensland, Brisbane, Queensland, Australia
7. Department of Radiation Oncology, Sidney Kimmel Medical College & Cancer Center at Thomas Jefferson University, Philadelphia, Pennsylvania
8. Department of Radiation Oncology and Molecular Radiation Sciences, Johns Hopkins University School of Medicine, Baltimore, Maryland
9. Radiation Oncology Service, Cleveland Veterans Affairs Medical Center, Cleveland, Ohio
10. Department of Radiation Oncology, University Hospital Cleveland Medical Center, Cleveland, Ohio
11. Department of Neurosurgery, Technical University of Munich (TUM), Munich, Germany