1. Department of Hematology, Amsterdam UMC, Vrije Universiteit Amsterdam, Cancer Center Amsterdam, Amsterdam, the Netherlands
2. HOVON Data Center, Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, the Netherlands
3. Department of Internal Medicine, Rijnstate Hospital, Arnhem, the Netherlands
4. Department of Internal Medicine, Admiraal de Ruijter Hospital, Goes, the Netherlands
5. Department of Hematology, Centre Hospitalier Jolimont, Haine-Saint-Paul, Belgium
6. Department of Internal Medicine/Hematology, St Antonius Hospital, Nieuwegein, the Netherlands
7. Department of Internal Medicine, Zuyderland Medical Center, Sittard-Geleen, the Netherlands
8. Department of Hematology, Bernhoven Hospital, Uden, the Netherlands
9. Department of Internal Medicine, Diakonessenhuis, Utrecht, the Netherlands
10. Department of Internal Medicine-Hematology, Franciscus Hospital location Vlietland, Schiedam, the Netherlands
11. Department of Internal Medicine, Bravis Hospital, Roosendaal, the Netherlands
12. Department of Internal Medicine, Medisch Centrum Leeuwarden, Leeuwarden, the Netherlands
13. Department of Hematology, St Luc Hospital, Bruxelles, Belgium
14. Department of Internal Medicine, Amstelland Hospital, Amstelveen, the Netherlands
15. Department of Internal Medicine, Amphia Hospital, Breda, the Netherlands
16. Department of Hematology, Reinier de Graaf Groep, Delft, the Netherlands
17. Department of Internal Medicine, Deventer Hospital, Deventer, the Netherlands; Currently Isala, Zwolle, the Netherlands
18. Department of Internal Medicine, Tergooi Hospital, Hilversum, the Netherlands
19. Department of Internal Medicine, Canisius-Wilhelmina Hospital, Nijmegen, the Netherlands
20. Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, the Netherlands
21. Department of Internal Medicine, Meander Medical Center, Amersfoort, the Netherlands
22. Department of Internal Medicine, Albert Schweitzer Hospital, Dordrecht, the Netherlands