1. Sarcoma Unit, Department of Medical Oncology, University Hospital of Bern, Bern, Switzerland;
2. Sarcoma Unit, Royal Marsden NHS Foundation Trust and Institute of Cancer Research, London, UK;
3. Sarcoma Unit, Department of Cancer Medicine, Fondazione IRCCS Istituto Nazionale Tumori, Milan, Italy;
4. Department of Medical Oncology, Leiden University Medical Center, RC Leiden, The Netherlands;
5. Oncology Department, National Cancer Institute "Giovanni Paolo II", Bari, Italy;
6. Division of Medical Oncology, Candiolo Cancer Institue–FPO, IRCCS, Candiolo, Italy;
7. Department of Medical Oncology, Pharmacology the Netherlands Cancer Institute, Amsterdam, The Netherlands;
8. Department of Oncology, Aarhus University Hospital, Aarhus, Denmark;
9. Sharett Institute of Oncology, Hadassah-Hebrew University Medical Center, Kiryat Hadassah, Jerusalem, Israel;
10. La Timone University Hospital & Aix-Marseille University (AMU), Marseille, France;
11. Department of Medical Oncology, Erasmus MC–Cancer Institute, Erasmus University Medical Center, CE Rotterdam, The Netherlands;
12. Department of Medical Oncology, Radboud University Medical Center, GA Nijmegen, The Netherlands;
13. European Organization for Research and Treatment of Cancer (EORTC), Bruxelles, Belgium;
14. Department of Surgery, Fondazione IRCCS Istituto Nazionale dei Tumori, Milano, Italy;
15. Sarcoma Unit, Interdisciplinary Tumor Center, Mannheim University Medical Center, University of Heidelberg, Mannheim, Germany