1. 1Department of Internal Medicine III, LMU University Hospital Munich, Munich, Germany
2. 2Department of Hematology, Erasmus MC Cancer Institute, University Medical Center Rotterdam, Rotterdam, Netherlands
3. 3Department of Hematology, Hospital Clinic of Barcelona, IDIBAPS, CIBERONC, GELTAMO, Barcelona, Spain
4. 4Division of Oncology, Skane University Hospital and Lund University, Lund, Sweden
5. 5Department of Lymphoid Malignancies, Maria Skłodowska-Curie National Research Institute of Oncology, Warsaw, Poland
6. 6Department of Hematology, Rigshospitalet, Copenhagen University Hospital, Copenhagen, Denmark
7. 7Swiss Group for Clinical Cancer Research (SAKK), Bern, Switzerland
8. 8Oncology and Hematology, Kantonsspital Graubünden, Chur, Switzerland
9. 9Department of Oncology, Oslo University Hospital, Oslo, Norway
10. 10First Department of Internal Medicine - Hematology, General University Hospital and First Faculty of Medicine, Charles University, Prague, Czech Republic
11. 11Department of Hematology, University Hospitals Leuven, Leuven, Belgium
12. 12U.O. di Ematologia, Ospedale degli Infermi di Rimini, Rimini, Italy
13. 13Institute of Hematology, Assuta Medical Centers, Tel-Aviv, Israel
14. 14Department of Hematology, Instituto Português de Oncologia de Lisboa, Lisbon, Portugal
15. 15Department of Oncology, University of Helsinki and Helsinki University Hospital Comprehensive Cancer Center, Helsinki, Finland
16. 16Institute for Medical Information Processing, Biometry and Epidemiology (IBE), LMU University Munich, Munich, Germany
17. 17Clinic for Internal Medicine II - Haematology, Oncology, University Clinic Schleswig-Holstein, Kiel, Germany
18. 18Department of Pathology, Hematopathology Section and Lymph Node Registry, Universitätsklinikum Schleswig-Holstein, Kiel, Germany
19. 19Department of Translational Medicine, University of Eastern Piedmont and Az Ospedaliera Santi Antonio e Biagio e Cesare Arrigo, Alessandria, Italy
20. 20Institute for Medical Information Processing, Biometry and Epidemiology, LMU Munich, Munich, Germany