1. Department of Hematology, Amsterdam UMC, Vrije Universiteit, the Netherlands
2. Cancer Center Amsterdam, Treatment and Quality of Life, the Netherlands
3. Department of Hematology, Oslo Myeloma Center, Oslo University Hospital, Norway
4. KG Jebsen Center for B Cell Malignancies, University of Oslo, Norway
5. Department of Hematology, HOVON Data Center, Erasmus MC Cancer Institute, Rotterdam, the Netherlands
6. Department of Internal Medicine, Albert Schweitzer Hospital, Dordrecht, the Netherlands
7. Department of Hematology, Skåne University Hospital Lund, Sweden
8. Department of Internal Medicine, Maasstad Hospital, Rotterdam, the Netherlands
9. Department of Internal Medicine, Meander Medical Centre, Amersfoort, the Netherlands
10. Institute of Clinical and Molecular Medicine, Norwegian University of Science and Technology (NTNU), Trondheim, Norway
11. Department of Oncology and Hematology, Førde Central Hospital, Norway
12. Department of Internal Medicine, Helsingborg Hospital, Sweden
13. Haematology Department H 60, Roskilde Sjaelland University, Denmark
14. Department of Hematology, Aalborg University Hospital, Denmark
15. Department of Internal Medicine, Rijnstate Hospital, Arnhem, the Netherlands
16. Department for Blood and Cancer Diseases, Stavanger University Hospital, Norway
17. Institute of Heamatology, Uddevalla Hospital, Sweden
18. Department of Hematology, Haga Hospital, The Hague, the Netherlands
19. Hematology Department, Sahlgrenska University Hospital, Gothenburg, Sweden
20. Department of Internal Medicine, Sodra Alvsborgs Sjukhus, Boras, Sweden
21. Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, the Netherlands
22. Department of Hematology, Aarhus University Hospital, Denmark
23. Department of Hematology, Rigshospitalet, Copenhagen, Denmark
24. Department of Hematology, Hematology Research Unit and Academy of Geriatric Research, Odense University Hospital and University of Southern Denmark, Denmark