1. Department of Oncology, Helsinki University Hospital and University of Helsinki, Helsinki, Finland
2. Department of Oncology, Skåne University Hospital and Lund University, Lund, Sweden
3. Department of Oncology, The Norwegian Radium Hospital, Oslo University Hospital, Oslo, Norway
4. Helios Klinikum Berlin-Buch, Sarkomzentrum Berlin-Brandenburg, Berlin, Germany
5. Universitätsklinikum Tübingen, Tübingen, Germany
6. Schwerpunktpraxis Oncology/Hematology, Düsseldorf, Germany
7. Department of Gastroenterology, University of Göttingen, Göttingen, Germany
8. Division of Surgical Oncology & Thoracic Surgery, Mannheim University Medical Center, Mannheim, Germany
9. Medical Department III, Klinikum rechts der Isar, Technical University of Munich, Munich, Germany
10. Klinik für Onkologie und Hämatologie am Krankenhaus Nordwest, Frankfurt, Germany
11. Department of Medicine III, University Hospital, LMU Munich, Munich, Germany
12. Sarcoma Center, West German Cancer Center, Essen, Germany
13. Gerhard-Domagk-Institute of Pathology, University of Münster, Münster, Germany
14. Department of Surgery, Sahlgrenska University Hospital, Gothenburg, Sweden
15. Department of Oncology and Radiotherapy, Oulu University Hospital, Oulu, Finland
16. 4Pharma Ltd, Turku, Finland
17. Department of Cancer Epidemiology, Lund University, Lund, Sweden