1. Center for Clinical Transfusion Research, Sanquin Blood Supply
2. Department of Clinical Epidemiology; Leiden University Medical Center
3. Department of Cardiothoracic Surgery; Leiden University Medical Center; Leiden the Netherlands
4. Haga Teaching Hospital, Department of Hematology; The Hague the Netherlands
5. TRIP National Hemovigilance Foundation, Hemovigilance and Biovigilance Office
6. Donor Services Unit, Sanquin Blood Supply; Leiden the Netherlands