1. Department of Hematology, University Medical Center Groningen, University of Groningen, Groningen, The Netherlands;
2. Department of Hematology, HOVON Data Center, Erasmus MC Cancer Institute, Rotterdam, The Netherlands;
3. Department of Hematology, Cliniques Universitaires St. Luc, Brussels, Belgium;
4. Department of Hematology, Erasmus MC, Rotterdam, The Netherlands;
5. Department of Hematology, Amsterdam University Medical Center, VU University Medical Center, Cancer Center Amsterdam, Amsterdam, The Netherlands;
6. Department of Hematology, Amsterdam University Medical Center, Academic Medical Center Amsterdam, Amsterdam, The Netherlands;
7. Department of Hematology, Jeroen Bosch Hospital, Den Bosch, The Netherlands;
8. Department of Hematology, Citadelle, Liege, Belgium;
9. Department of Hematology, Université Catholique de Louvain, University Medical Center Catholic University of Leuven Namur, Yvoir, Belgium;
10. Department of Hematology, Isala Hospital, Zwolle, The Netherlands;
11. Department of Hematology, Antonius Hospital, Nieuwegein, The Netherlands;
12. Department of Hematology, Hospital Network Antwerp (ZNA) Stuivenberg/Middelheim, Antwerp, Belgium;
13. Department of Hematology, Meander Hospital Amersfoort, Amersfoort, The Netherlands;
14. Department of Hematology, University Medical Center Utrecht, Utrecht, The Netherlands;
15. Department of Hematology, General Hospital Delta Roeselare, Roeselare, Belgium; and
16. Department of Hematology, Our Dear Lady Hospital (OLVG), Amsterdam, The Netherlands