1. From the Children’s Hospital of Eastern Ontario (S.D.), Children’s Hospital of Eastern Ontario Research Institute (S.D., L.H., A. van Beinum, M.H., H.T.), Faculty of Medicine (S.D.) and Centre for Health Law, Policy, and Ethics (J.A.C.), University of Ottawa, Canadian Blood Services (L.H., S.D.S.), Carleton University (A. van Beinum), the Dynamical Analysis Lab (N.B.S., C.H., A.S.), Clinical Epidemiology Program (N.B.S., C.H., A.S.), and Clinical Epidemiology Program Methods Centre (T.R.), Ottawa...