1. Department of Hematology, Oncology and Rheumatology, University of Heidelberg, Heidelberg, Germany
2. National Center for Tumour Diseases, University of Heidelberg, Heidelberg, Germany
3. Department of Hematology, Oncology, and Pneumology, University Medical Center of the Johannes Gutenberg University Mainz, Mainz, Germany
4. Department of Hematology, Oncology, Immunology and Rheumatology, University of Tübingen, Tübingen, Germany
5. Asklepios Klinik Hamburg Altona, Germany
6. Klinikum Chemnitz, Germany
7. Department of Hematology, Oncology and Clinical Immunology, University Düsseldorf, Düsseldorf, Germany
8. Department of Hematology, University of Essen, Essen, Germany