1. Department of Hematology, Erasmus University Medical Center (MC), Rotterdam, The Netherlands;
2. Inselspital, Bern, Switzerland;
3. Department of Hematology, University Hospital Gasthuisberg, Leuven, Belgium;
4. HOVON Data Center, Erasmus University MC Cancer Institute, Rotterdam, The Netherlands;
5. Department of Hematology, Academic Medical Center, Amsterdam, The Netherlands;
6. Department of Hematology, University Hospital, Maastricht, The Netherlands;
7. Department of Hematology, University Hospital, Lausanne, Switzerland;
8. Department of Hematology, University Medical Center, Groningen, The Netherlands;
9. UCL Namur (Godinne), Yvoir, Belgium;
10. Department of Hematology, Hôpital St. Luc, Brussels, Belgium;
11. St. Antonius Hospital, Nieuwegein, The Netherlands;
12. Medisch Spectrum Twente, Enschede, The Netherlands;
13. Department of Hematology, University Medical Center, Utrecht, The Netherlands;
14. Isala Hospital, Zwolle, The Netherlands;
15. Haukeland University Hospital, Bergen, Norway;
16. Department of Hematology, VU University Medical Center, Amsterdam, The Netherlands;
17. Haga Hospital, The Hague, The Netherlands;
18. Hôpital Citadelle, Liège, Belgium;
19. Ziekenhuis Netwerk Antwerpen, Antwerp, Belgium;
20. Department of Hematology, University Hospital and University of Geneva, Geneva, Switzerland;
21. Department of Hematology, University Hospital, Basel, Switzerland; and
22. Department of Hematology, University Hospital, Zurich, Switzerland