VU University Amsterdam - Department of Hematology, Erasmus University Rotterdam (EUR) - Clinical Trial Center, Utrecht University, University Medical Center, Cancer Center, Department of Hematology, University of Groningen - Department of Hematology and Oncology, Radboud University Nijmegen - Department of Hematology, University of Amsterdam, Academic Medical Center, Department of Hematology, Leiden University, Medical Center (LUMC), Department of Hematology, Haga Hospital - Department of Hematology, Medisch Spectrum Twente - Department of Hematology, St. Antonius Ziekenhuis - Department of Hematology, Meander Medical Center - Department of Hematology, KU Leuven, Faculty of Medicine, Department of Hematology, Albert Schweitzer Hospital - Department of Internal Medicine, Maastricht University, Medical Center, Department of Hematology, Zuyderland Medical Center - Department of Hematology, Jeroen Bosch Hospital - Department of Hematology, Isala Zwolle - Department of Hematology, Medical Center Leeuwarden - Department of Hematology, VU University Amsterdam - Department of Hematology, Erasmus University Rotterdam (EUR) - Department of Hematology and VU University Amsterdam - Department of Hematology