1. Institute of Clinical Cancer Research (IKF) at Krankenhaus Nordwest, UCT-University Cancer Center, Frankfurt, Germany;
2. Department of Internal Medicine II, Academic Teaching Hospital Wolfsburg, Wolfsburg, Germany;
3. Krankenhaus Dresden-Friedrichstadt, IV. Medizinische Klinik, Dresden, Germany;
4. University Hospital, Medical Center II, Tuebingen, Germany;
5. Department of Medical Oncology, National Center for Tumor Diseases, Heidelberg University Hospital, Heidelberg, Germany;
6. UKSH Campus Luebeck, Lubeck, Germany;
7. Ruhr-University Bochum, Bochum, Germany;
8. University Hospital Carl Gustav Carus, Dresden, Germany;
9. Klinikum Bielefeld, Bielefeld, Germany;
10. Klinikum Ludwigsburg, Ludwigsburg, Germany;
11. Charité Universitätsmedizin Berlin, Berlin, Germany;
12. Klinikum Aschaffenburg, Aschaffenburg, Germany;
13. Department of Gastroenterology and Hepatology, University Hospital Frankfurt, Frankfurt, Germany;
14. Onkologisches Ambulanzzentrum, Hannover, Germany;
15. Department of Oncology and Hematology, Krankenhaus Nordwest, Frankfurt, Germany;
16. Department of Medical Oncology, West German Cancer Center, University Hospital Essen, Essen, Germany;
17. University Hospital Essen, Essen, Germany;
18. University Medical Center Mannheim, Mannheim, Germany;