1. From the Department of Medicine, Rutgers Robert Wood Johnson Medical School, New Brunswick, NJ (J.L.C., W.J.K., H.N., S.K.); the Departments of Epidemiology and Biostatistics, School of Public Health, University of Pittsburgh (M.M.B., M.B., S.F.K.), and the Department of Pathology, Division of Transfusion Medicine, University of Pittsburgh School of Medicine (D.J.T.) — both in Pittsburgh; the Bruyere Research Institute, University of Ottawa (P.C.H.), and the Clinical Epidemiology Program, Ottawa Hospital...