1. Klinikum der Universität München, Interdisciplinary Tumor Center (CCC LMU), Sarcoma Unit (SarKUM), Marchioninistr. 15; München D-81377 Germany
2. European Organisation for Research and Treatment of Cancer (EORTC) Data Centre, Avenue Mounier 83/11; Brussels B-1200 Belgium
3. Erasmus MC Cancer Institute, Groene Hilledijk 301; Rotterdam EA 3075 The Netherlands
4. The Sarcoma Unit; Royal Marsden NHS Foundation Trust, Fulham Road; London SW3 6JJ United Kingdom
5. Department of Medical Oncology, 229 cours de l'Argonne; Institut Bergonie; Bordeaux Cedex 33076 France
6. University of Heidelberg, Mannheim University Medical Center, Interdisciplinary Tumor Center, Sarcoma Unit, Theodor-Kutzer-Ufer 1-3; Mannheim D-68167 Germany
7. Department of Clinical Oncology; Leiden University Medical Centre, Albinusdreef 2; Leiden ZA 2333 The Netherlands
8. Gerhard-Domagk-Institut für Pathologie, Universitätsklinikum Münster; Münster 48149 Germany
9. Institut Gustave Roussy; Villejuif France
10. Department of Medicine, NetSARC and LYRIC; Centre Leon Berard; Lyon France
11. Department of Medical Oncology; University Hospital Virgen del Rocio and Biomedicine Research Institute (IBIS); Sevilla Spain
12. Radboud University Medical Center Nijmegen; the Netherlands
13. Department of Surgery-Sarcoma Service; Fondazione IRCCS Istituto Nazionale dei Tumori, Via Venezian 1; Milan 20133 Italy
14. Division of Clinical Studies; Institute of Cancer Research; Sutton United Kingdom