1. Division of Paediatric Intensive Care Medicine; Department of Paediatrics; Sainte-Justine Hospital; Université de Montréal; Montréal QC Canada
2. Division of Intensive Care Medicine; Department of Medicine; Centre Hospitalier Universitaire de Montréal; Montréal QC Canada
3. Methods Centre of the Ottawa Hospital Research Institute; Ottawa General Hospital; University of Ottawa; Ottawa ON Canada
4. Division of Hematology; Department of Medicine; Ottawa General Hospital; University of Ottawa; Ottawa ON Canada
5. Edinburgh Royal Infirmary; University of Edinburgh; Edinburgh UK
6. NHS Blood and Transplant/Oxford University Hospitals NHS Trust; University of Oxford; Oxford UK
7. Health Economics Research Centre; Nuffield Department of Population Health; University of Oxford; Oxford UK
8. Edinburgh Clinical Trials Unit; University of Edinburgh; Edinburgh UK
9. Transfusion Laboratory; Oxford University Hospitals NHS Trust; Oxford UK