1. Center for Clinical Transfusion Research Sanquin Research Leiden The Netherlands
2. Department of Immunohematology and Blood Transfusion Leiden University Medical Center Leiden The Netherlands
3. Department of Clinical Epidemiology Leiden University Medical Center Leiden The Netherlands
4. Department of Hematology Radboud University Medical Center Nijmegen The Netherlands
5. Department of Clinical Chemistry and Hematology University Medical Center Utrecht Utrecht The Netherlands
6. Department of Clinical Chemistry and Hematology Catharina Hospital Eindhoven The Netherlands
7. Department of Hematology Amsterdam University Medical Center, location VU Medical Center Amsterdam The Netherlands
8. Department of Clinical Chemistry and Hematology Jeroen Bosch Hospital 's‐Hertogenbosch The Netherlands
9. LabWest, Haga Teaching Hospital The Hague The Netherlands