1. Department of Radiotherapy The Netherlands Cancer Institute Amsterdam The Netherlands
2. Department of Radiation Oncology The Leiden University Medical Center Leiden The Netherlands
3. Sarcoma Patients EuroNet Association (SPAEN) Friedberg Germany
4. Department of Surgical Oncology The Netherlands Cancer Institute Amsterdam The Netherlands
5. Sarcoma Unit, Department of Surgery The Royal Marsden Hospital London United Kingdom
6. Department of Surgical Oncology The Leiden University Medical Center Leiden The Netherlands
7. Division of Surgical Oncology, Department of Surgery Brigham and Women's Hospital Boston Massachusetts
8. Center for Sarcoma and Bone Oncology Dana‐Farber Cancer Institute Boston Massachusetts
9. Harvard Medical School Boston Massachusetts
10. Department of Radiation Oncology Brigham and Women's Hospital Boston Massachusetts
11. Department of Surgical Oncology IRCCS Foundation National Cancer Institute Milan Italy
12. Department of Orthopedic Surgery, Sarcoma Unit Mount Sinai Hospital Toronto Ontario Canada
13. Department of Orthopedic Oncology The Leiden University Medical Center Leiden The Netherlands
14. Department of Surgical Oncology The Maria Sklodowska‐Curie Institute Oncology Center Warsaw Poland
15. Radiation Oncology IRCCS Foundation National Cancer Institute Milan Italy
16. Adult Mesenchymal and Rare Tumor Unit Medical Oncology IRCCS Foundation National Cancer Institute Milan Italy