1. Department of Internal Medicine III, University Hospital of Ulm, Ulm, Germany;
2. Department of Hematology, Hemostasis, Oncology and Stem Cell Transplantation, Hannover Medical School, Hannover, Germany;
3. Department of Oncology and Hematology, Klinikum Oldenburg, Oldenburg, Germany;
4. Department of Internal Medicine II, University Hospital Schleswig-Holstein Kiel, Kiel, Germany;
5. Department of Internal Medicine, University of Saarland, Homburg, Germany;
6. Department of Internal Medicine III, University Hospital of Bonn, Bonn, Germany;
7. Department of Internal Medicine III, Städtisches Klinikum Karlsruhe, Karlsruhe, Germany;
8. Department of Hematology, Oncology and Clinical Immunology, Heinrich-Heine-University, Düsseldorf, Germany;
9. Department of Internal Medicine III, University of Munich, Munich, Germany;
10. Department of Internal Medicine IV, University Hospital of Giessen, Giessen, Germany;
11. Department of Internal Medicine V, University Hospital Innsbruck, Innsbruck, Austria;
12. Institute of Cell and Molecular Pathology, Hannover Medical School, Hannover, Germany; and
13. Abteilung Biostatistik, German Cancer Research Center, Heidelberg, Germany