1. Department of Hematology, Erasmus MC Cancer Institute, University Medical Center Rotterdam, Rotterdam, the Netherlands
2. Department of Hematology, Cancer Center Amsterdam, Amsterdam University Medical Center, Amsterdam, the Netherlands
3. Department of Hematology, Oslo University Hospital, Oslo, Norway
4. Department of Hematology, Isala Hospital, Zwolle, the Netherlands
5. Department of Medical Oncology and Hematology, Comprehensive Cancer Center Zurich, University Hospital Zurich, Zurich, Switzerland
6. Department of Hematology, Maxima Medisch Centrum, Eindhoven, the Netherlands
7. Department of Hematology, Cliniques universitaires Saint-Luc, Brussels, Belgium