From the Division of Neonatal-Perinatal Medicine, Dalhousie University, Halifax, NS, Canada (J.D.); and Bliss, London (J.A., M.P.), the National Perinatal Epidemiology Unit Clinical Trials Unit, Nuffield Department of Population Health, University of Oxford (B.B., U.B., O.H., E.J., L.L., O.O., C.P., J.T.), and John Radcliffe Hospital (K.M.), Oxford, the Newcastle Neonatal Service, Royal Victoria Infirmary, Newcastle upon Tyne (J.B., N.E.), the Department of Health Sciences, University of Leicester, Leicester (E.B., S.J.), the National Institute for Health Research Southampton Biomedical Research Centre, Department of Child Health, Southampton (A.L.), the Centre for Reviews and Dissemination, University of York, York (W.M.), the School of Health and Population Sciences, University of Birmingham, Birmingham (T.R.), and the Simpson Centre for Reproductive Health, Royal Infirmary of Edinburgh, Edinburgh (B.S.) - all in the United Kingdom.