1. Department of Paediatrics Leiden University Medical Center Leiden The Netherlands
2. Department of Pathology Radboud University Medical Center Nijmegen The Netherlands
3. Department of Pathology Amsterdam University Medical Centers Amsterdam The Netherlands
4. Department of Pathology Erasmus MC University Medical Center Rotterdam Rotterdam The Netherlands
5. Department of Pathology Leiden University Medical Center Leiden The Netherlands
6. PALGA Foundation (Nationwide Network and Registry of Histopathology and Cytopathology) Houten The Netherlands
7. Department of Haematology Radboud University Medical Center Nijmegen The Netherlands
8. Department of Haematology Amsterdam University Medical Centers Amsterdam The Netherlands
9. Department of Haematology Flevoziekenhuis Almere The Netherlands
10. Department of Internal Medicine Erasmus MC University Medical Center Rotterdam Rotterdam The Netherlands
11. Department of Immunology Erasmus MC University Medical Center Rotterdam Rotterdam The Netherlands
12. Department of Haematology Erasmus MC University Medical Center Rotterdam Rotterdam The Netherlands
13. Department of Internal Medicine Albert Schweitzer Ziekenhuis Dordrecht The Netherlands
14. Princess Máxima Center for Paediatric Oncology Utrecht The Netherlands