1. University Medical Center of Hamburg-Eppendorf, Hamburg, Germany;
2. Medical Center of Hamburg-Eppendorf, Hamburg, Germany;
3. University Hospital Tuebingen, Tübingen, Germany;
4. Klinik für Innere Medizin III, Klinikum Chemnitz, Chemnitz, Germany;
5. Department of Internal Medicine III, Charité Campus Benjamin Franklin, Berlin, Germany;
6. Klinikum Bielefeld, Bielefeld, Germany;
7. Johanniter Krankarhaus, Bonn, Germany;
8. Universitätsklinikum Essen (AöR), Essen, Germany;
9. St Antonius Hospital, Eschweiler, Germany;
10. University Hospital Marburg, Marburg, Germany;
11. University Hospital Heidelberg, Heidelberg, Germany;
12. University Medical Center of the Johannes Gutenberg-University, Third Department of Medicine, Mainz, Germany;
13. Kliniken Maria Hilf GmbH, Mönchengladbach, Germany;
14. Klinikum Osnabrück GmbH, Osnabrueck, Germany;
15. Asklepios Tumorzentrum Hamburg, AK Altona and AK St Georg, Hamburg, Germany;
16. Center for Clinical Trials, University Hospital of Tuebingen, Tübingen, Germany;
17. Department of Biostatistics, German Cancer Research Center, Heidelberg, Germany;
18. University Medical Center Hamburg-Eppendorf, Hamburg, Germany;
19. University Hospital Heidelberg, Internal Medicine V and National Center for Tumor Diseases (NCT), Heidelberg, Germany;