1. Department of Hematology, Rigshospitalet, Copenhagen, Denmark;
2. Department of Clinical Biochemistry, Bispebjerg-Frederiksberg Hospital, Copenhagen, Denmark;
3. Hematology Branch, National Heart, Lung, and Blood Institute, National Institutes of Health, Bethesda, MD, USA;
4. Department of Microbiology, Rigshospitalet, Copenhagen, Denmark;
5. Department of Hematology, Leiden University Medical Centre, Leiden, The Netherlands;
6. Department of Hematology, Oslo University Hospital and Institute of Clinical Medicine, University of Oslo, Oslo, Norway;
7. Department of Hematology, Turku Central University Hospital, Turku, Finland;
8. Division of Hematology, Department of Medicine at Huddinge, Karolinska Institute, Stockholm, Sweden;
9. Department of Hematology, Hadassah University Hospital, Hebrew University Medical School, Jerusalem, Israel;
10. Department of Hematology, Stuivenberg Hospital, Antwerpen, Belgium;
11. Department of Hematology, Erasmus MC Cancer Center, Rotterdam, The Netherlands;
12. HOVON Data Centre, Erasmus MC, Rotterdam, The Netherlands;
13. Department of Internal Medicine, Gelderse Vallei Hospital, Amersfoort, The Netherlands;
14. Department of Clinical Hematology, Third Faculty of Medicine, Charles University Hospital Kralovske Vinohrady, Prague, Czech Republic;
15. Lymphoid Malignancies, Maria Sklodowska – Curie Memorial Institute and Oncology Centre, Warszawa, Poland;
16. Department of Hematology, Academisch Medisch Centrum, Amsterdam, The Netherlands