1. Department of Radiation Oncology The Netherlands Cancer Institute Amsterdam The Netherlands
2. Department of Radiation Oncology Leiden University Medical Centre Leiden The Netherlands
3. Department of Surgery Institute Curie Paris France
4. Unit of Clinical Epidemiology and Trial Organization IRCCS Foundation National Cancer Institute Milan Italy
5. Department of Surgery Royal Marsden Hospital NHS Foundation Trust London United Kingdom
6. Department of Surgical Oncology Mount Sinai Hospital and Princess Margaret Cancer Centre Toronto Ontario Canada
7. Department of Surgery University of Toronto Toronto Ontario Canada
8. Division of Surgical Oncology and Thoracic Surgery University Medical Center Mannheim, University of Heidelberg Heidelberg Germany
9. Department of Surgical Oncology The Netherlands Cancer Institute Amsterdam The Netherlands
10. Department of Soft Tissue/Bone Sarcoma and Melanoma Maria Sklodowska‐Curie Institute–Oncology Center Warsaw Poland
11. Department of Surgery IRCCS Foundation National Cancer Institute Milan Italy
12. Department of Surgery Institute Gustave Roussy Villejuif France
13. Division of Surgical Oncology, Department of Surgery Brigham and Women’s Hospital Boston Massachusetts
14. Center for Sarcoma and Bone Oncology, Dana‐Farber Cancer Institute Harvard Medical School Boston Massachusetts
15. Radiation Medicine Program Princess Margaret Cancer CentreToronto Ontario Canada
16. Department of Radiation Oncology University of Toronto Toronto Ontario Canada