1. Sarcoma Service; Department of Surgery; Scientific Institute for Research; Hospitalization; and Health Care (IRCCS) Foundation; National Cancer Institute; Milan Italy
2. Unit of Clinical Epidemiology and Trial Organization; IRCCS Foundation; National Cancer Institute; Milan Italy
3. Department of Pathology; The University of Texas MD Anderson Cancer Center; Houston Texas
4. The Sarcoma Research Center; The University of Texas MD Anderson Cancer Center; Houston Texas
5. Department of Pathology; IRCCS Foundation; National Cancer Institute; Milan Italy
6. Department of Surgical Oncology; The University of Texas MD Anderson Cancer Center; Houston Texas
7. Department of Medical Oncology; Gustave Roussy Institute; Villejuif France
8. Department of Surgery; Leiden University Medical Center; Leiden The Netherlands
9. Department of Pathology; Leiden University Medical Center; Leiden The Netherlands
10. Department of Surgery; Gustave Roussy Institute; Villejuif France
11. Department of Cancer Biology; The University of Texas MD Anderson Cancer Center; Houston Texas