1. Department of Medicine, Michael G. DeGroote School of MedicineMcMaster University Hamilton Ontario Canada
2. Department of Medicine, McMaster Centre for Transfusion ResearchMcMaster University Hamilton Ontario Canada
3. Department of Statistics and Actuarial ScienceUniversity of Waterloo Waterloo Ontario Canada
4. Department of Health Research Methods, Impact and EvidenceMcMaster University Hamilton Ontario Canada
5. Canadian Blood Services Hamilton Ontario Canada