1. Division of Neonatal-Perinatal Medicine; University of Vermont; Burlington Vermont USA
2. Newborn Services; John Radcliffe Hospital, Oxford University Hospitals NHS Foundation Trust; Oxford UK
3. National Perinatal Epidemiology Unit, Clinical Trials Unit, Nuffield Department of Population Health, Medical Sciences Division; University of Oxford; Oxford UK
4. Department of Clinical Sciences Lund, Paediatrics; Lund University, Skåne University Hospital; Lund Sweden
5. Newborn Research Centre and Neonatal Services; The Royal Women’s Hospital; Melbourne Australia
6. Division of Neonatal-Perinatal Medicine, Department of Pediatrics; Larner College of Medicine at the University of Vermont; Burlington Vermont USA