1 Department of Paediatrics, Tergooi Hospital, Hilversum, Netherlands; Department of Paediatrics, Amsterdam University Medical Centers-Emma Children's Hospital, Amsterdam, Netherlands.
2 Department of Paediatrics, Amsterdam University Medical Centers-Emma Children's Hospital, Amsterdam, Netherlands.
3 Division of Neonatal and Developmental Medicine, Department of Pediatrics, Stanford University School of Medicine, CA, USA.
4 Perinatal Research Unit, Division of Research, Kaiser Permanente Northern California, Oakland, CA, USA.
5 Division of Neonatology, The Children's Hospital of Philadelphia, Philadelphia, PA, USA; Perelman School of Medicine, University of Pennsylvania, PA, USA.
6 Department of Paediatrics, Erasmus University Medical Centre-Sophia Children's Hospital, Rotterdam 300, Netherlands. Electronic address: n.achten@erasmusmc.nl.