1. From the Departments of Neonatology (L.E.G., E.A.D., C.M.N.C., E.M.O., L.K.M., C.P.F.O.) and Radiology (N.C.A.), National Maternity Hospital, and the School of Medicine (L.E.G., C.M.N.C., E.M.O., L.K.M., C.P.F.O.) and the Centre for Support and Training in Analysis and Research (CSTAR), School of Public Health, Physiotherapy, and Sports Science (A.V.), University College Dublin — both in Dublin.