1. Center for Clinical Transfusion Research, Sanquin Research; Leiden the Netherlands
2. Department of Clinical Epidemiology; Leiden University Medical Center; Leiden the Netherlands
3. Department of Medical Statistics; Leiden University Medical Center; Leiden the Netherlands
4. Departments of Hematology and Clinical Chemistry; Onze Lieve Vrouwe Gasthuis; Amsterdam the Netherlands
5. Department of Clinical Chemistry and Hematology; Catharina Hospital; Eindhoven the Netherlands
6. Department of Immunohaematology and Blood Transfusion; Leiden University Medical Center; Leiden the Netherlands
7. Department of Internal Medicine-Hematology; Maastricht University Medical Center; Maastricht the Netherlands
8. Department of Clinical Chemistry; Maasstad Ziekenhuis; Rotterdam the Netherlands
9. LabWest, Haga Teaching Hospital; The Hague the Netherlands
10. Department of Clinical Chemistry; Isala; Zwolle the Netherlands
11. Department of Clinical Chemistry and Hematology; University Medical Center Utrecht; Utrecht the Netherlands
12. Department of Clinical Chemistry and Hematology; Jeroen Bosch Hospital; ‘s Hertogenbosch the Netherlands
13. Department of Hematology; VU Medical Center; Amsterdam the Netherlands
14. Department of Hematology; Newcastle upon Tyne Hospitals NHS Foundation Trust; Newcastle upon Tyne United Kingdom