1. Center for Clinical Transfusion Research Sanquin Research Leiden The Netherlands
2. Department of Haematology Leiden University Medical Center Leiden The Netherlands
3. Department of Clinical Epidemiology Leiden University Medical Center Leiden The Netherlands
4. Department of Haematology Radboud University Medical Center Nijmegen The Netherlands
5. Department of Immunohaematology Diagnostics Sanquin Amsterdam The Netherlands
6. Central Diagnostic Laboratory University Medical Center Utrecht Utrecht The Netherlands
7. Department of Clinical Chemistry and Haematology Catharina Hospital Eindhoven The Netherlands
8. Department of Clinical Chemistry Amsterdam University Medical Center, VUmc Amsterdam The Netherlands
9. Department of Clinical Chemistry and Haematology Jeroen Bosch Hospital 's‐Hertogenbosch The Netherlands
10. LabWest Haga Teaching Hospital The Hague The Netherlands