1. Department of Medicine, Schulich School of Medicine and Dentistry, Western University, London, ON, Canada;
2. Departments of Medicine, Laboratory Medicine, and Pathobiology, and Institute of Health Policy, Management, and Evaluation, Mount Sinai Hospital, University of Toronto, Toronto, ON, Canada;
3. Canadian Blood Services, Toronto, ON, Canada;
4. Maternal-Infant Care Research Centre, Mount Sinai Hospital, University of Toronto, Toronto, ON, Canada;
5. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, and
6. Department of Medicine, McMaster University, Hamilton, ON, Canada;
7. Canadian Blood Services, Hamilton, ON, Canada; and
8. Department of Paediatrics and Institute of Health Policy, Management and Evaluation, and
9. Division of Maternal-Fetal Medicine, Department of Obstetrics and Gynecology, Mount Sinai Hospital, University of Toronto, Toronto, ON, Canada