1. Department of Pathology and Molecular Medicine, and
2. Department of Medicine, Michael G. DeGroote School of Medicine, McMaster University, Hamilton, ON, Canada;
3. Department of Statistics and Actuarial Science, University of Waterloo, Waterloo, ON, Canada; and
4. Transfusion Medicine and Hemostasis, Department of Pathology, University of Texas Southwestern Medical Center, Dallas, TX