1. 1Department of Hematology, University Medical Center Utrecht, Utrecht, The Netherlands
2. 2Department of Hematology, Radboud University Medical Center; Nijmegen, The Netherlands
3. 3Department of Hematology, Erasmus MC Cancer Institute, Rotterdam, The Netherlands
4. 4Department of Hematology, Amsterdam University Medical Center, Amsterdam, The Netherlands
5. 5Department of Hematology, Isala Hospital, Zwolle, The Netherlands
6. 6Department of Hematology, University Medical Center Groningen, Groningen, The Netherlands
7. 7Department of Hematology, Leiden University Medical Center, Leiden, The Netherlands
8. 8Central Diagnostic Laboratory, University Medical Center Utrecht, Utrecht, The Netherlands