1. Department of Medicine, Division of Hematology, and
2. Division of Cardiac Surgery, University of Toronto, Toronto, ON, Canada;
3. Department of Clinical Pathology, Sunnybrook Health Sciences Centre, Toronto, ON, Canada;
4. Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada;
5. Department of Laboratory Medicine, University Health Network, University of Toronto, Toronto, ON, Canada;
6. Allogeneic Blood and Marrow Transplant Program, Princess Margaret Cancer Centre, University Health Network, Toronto, ON, Canada;
7. Robinson Institute, University of Adelaide, Adelaide, South Australia;
8. Regional Histocompatibility Laboratory, University Health Network, Toronto, ON, Canada; and
9. Blood Transfusion Service, Massachusetts General Hospital, Boston, MA