1. Department of Laboratory Medicine and Pathobiology, University of Toronto, Toronto, ON, Canada;
2. Department of Clinical Pathology, University Health Network, Toronto, ON, Canada;
3. Blood Center of Wisconsin, Milwaukee, WI;
4. Department of Medicine, McMaster University, Hamilton, ON, Canada;
5. Canadian Blood Services, Hamilton, ON, Canada;
6. National Health Service Blood and Transplant/Oxford University Hospitals National Health Service Trust, John Radcliffe Hospital, Oxford, United Kingdom; and
7. Nuffield Department of Medicine, University of Oxford, Oxford, United Kingdom