VU University Amsterdam - Department of Haematology, University of Basel - University Hospital Basel, HOVON Foundation, University of Bern - Department of Medical Oncology, Utrecht University - University Medical Center (Utrecht), Isala Hospital, Radboud University Nijmegen - Radboud University Medical Center, University Hospital Zurich, University of Groningen - University Medical Center Groningen, ZNA Stuivenberg, ZNA Stuivenberg, Maastricht University, University of Amsterdam, Maxima Medical Centre, AZ Delta General Hospital, UCL Saint-Luc, Luzerner Kantonsspital, Leiden University, Medical Center (LUMC), Department of Hematology, Haga Hospital, Kantonsspital Baden, Erasmus University Rotterdam (EUR) - Department of Hematology, affiliation not provided to SSRN, HOVON Foundation, HOVON Foundation, Netherlands Cancer Institute, Erasmus University Rotterdam (EUR), University of Basel - University Hospital Basel, Radboud University, University of Amsterdam, University of Groningen - University Medical Center Groningen and Erasmus University Rotterdam (EUR)