1. Department of Internal Medicine II, Hematology and Oncology, University Hospital, Frankfurt, Germany;
2. Department of Lymphoid Malignancies, Maria Sklodowska-Curie Memorial Institute and Oncology Centre, Warsaw, Poland;
3. Department of Internal Medicine III, University Hospital, Ulm, Germany;
4. Department of Medicine III, Clinic Grosshadern, Munich, Germany;
5. Department of Hematology and Oncology, University Hospital, Essen, Germany;
6. Department of Hematology, Oncology, and Tumorimmunology, Charité Campus Benjamin Franklin, Berlin, Germany;
7. Department of Internal Medicine V, University of Heidelberg, Germany;
8. Department of Internal Medicine II, University Hospital of Schleswig Holstein, Campus Kiel, Kiel, Germany;
9. Department of Internal Medicine I, University Hospital Carl Gustav Carus, Dresden, Germany;
10. Department of Internal Medicine III, University of Bonn, Bonn, Germany;
11. Department of Medicine II, University Hospital, Mainz, Germany;
12. Department of Internal Medicine I, Clinic Bremen-Mitte, Bremen, Germany;
13. Department of Hematology/Oncology, University Hospital, Regensburg, Germany;
14. Institute for Radiotherapy, University Hospital, Erlangen, Germany; and
15. Institute for Human Genetics, University Clinic, Duesseldorf, Germany