1. Laboratory of Clinical Chemistry and Hematology LabWest / Haga Teaching Hospital The Hague The Netherlands
2. Department of Hematology Haga Teaching Hospital The Hague The Netherlands
3. Laboratory of Clinical Chemistry and Hematology, Tergooi Medical Centre Hilversum The Netherlands
4. Sanquin Diagnostics Amsterdam The Netherlands
5. Division of Hematology, Department of Pediatrics University of California San Francisco USA