1. Department of Hematology; Albert Schweitzer Hospital; Dordrecht The Netherlands
2. Department of Hematology; VU University Medical Center; Amsterdam The Netherlands
3. Department of Internal Medicine; Diakonessenhuis; Utrecht The Netherlands
4. Department of Hematology; Medical Center Leeuwarden; Leeuwarden The Netherlands
5. Department of Hematology; Erasmus University Medical Center; Rotterdam The Netherlands
6. Netherlands Comprehensive Cancer Organisation (IKNL); Utrecht The Netherlands