1. Center for Clinical Transfusion Research–Sanquin, Leiden, The Netherlands;
2. Department of Hematology, HagaZiekenhuis, Den Haag, The Netherlands;
3. Department of Medical Statistics and Bioinformatics and
4. Department of Immunohematology and Blood Bank, Leiden University Medical Center, Leiden, The Netherlands;
5. Juravinsky Hospital, Hamilton, ON, Canada;
6. Maastricht University Medical Center, Maastricht, The Netherlands;
7. Erasmus Medical Center, Rotterdam, The Netherlands;
8. Ottawa Hospital, Ottawa, ON, Canada;
9. Sunnybrook Health Sciences Centre, Toronto, ON, Canada;
10. London Health Sciences Center, London, ON, Canada;
11. Kingston General Hospital, Kingston, ON, Canada;
12. Blood Systems Research Institute, San Francisco, CA;
13. Department of Microbiology, Immunology and Pathology, Colorado State University, Fort Collins, CO;
14. Haukeland University Hospital, Bergen, Norway;
15. Department of Medicine, McMaster University, Hamilton, ON, Canada; and
16. Department of Clinical Epidemiology, Leiden University Medical Center, Leiden, The Netherlands