1. Department of Radiation Oncology Netherlands Cancer Institute Amsterdam the Netherlands
2. Department of Radiation Oncology Leiden University Medical Center Leiden the Netherlands
3. Ente Ospedliero Cantonale, Oncology Institute of Southern Switzerland Bellinzona Switzerland
4. European Organization for Research and Treatment of Cancer (EORTC) Headquarters Brussels Belgium
5. Department of Oncology Rambam Medical Center Haifa Israel
6. Department of Radiation Oncology Gustave Roussy Institute Paris France
7. Department of Radiation Oncology University Hospital Zurich Zurich Switzerland
8. Department of Radiation Oncology IRCCS FoundationNational Cancer Institute Milan Italy
9. Department of Radiation Oncology Mount Sinai Hospital Toronto Ontario Canada
10. Department of Radiation Oncology The Royal Marsden National Health Service Foundation Trust and The Institute of Cancer Research London United Kingdom
11. Department of Radiation Oncology Catharina Hospital Eindhoven the Netherlands
12. Department of Surgery IRCCS FoundationNational Cancer Institute Milan Italy
13. Department of Pathology Leiden University Medical Center Leiden the Netherlands
14. Department of Medical Oncology Leiden University Medical Center Leiden the Netherlands
15. Sarcoma Unit of the Interdisciplinary Tumor Center Mannheim University Medical CenterUniversity of Heidelberg Mannheim Germany
16. Center for Proton Therapy Paul Scherrer InstituteETH Domain Villigen Switzerland
17. Radiation Oncology Department University Hospital of Bern Bern Switzerland
18. Radiation Oncology Department University Hospital of Zurich Zurich Switzerland
19. Department of Surgery Curie InstituteUniversity of Paris Paris France