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 Immuno-hematology and Blood Transfusion; Leiden University Medical Center; Leiden the Netherlands
4. Department of Clinical Chemistry and Haematology; University Medical Center Utrecht; Utrecht the Netherlands
5. Department of Medical Statistics; Leiden University Medical Center; Leiden the Netherlands