1. Women and Children’s Division, Department of Neonatology, Oslo University Hospital Rikshospitalet, Oslo, Norway2Norwegian Neonatal Network, Oslo University Hospital Rikshospitalet, Oslo, Norway
2. Women and Children’s Division, Department of Neonatology, Oslo University Hospital Rikshospitalet, Oslo, Norway
3. Women and Children’s Division, Department of Pediatrics, Oslo University Hospital, Oslo, Norway4Faculty of Medicine, University of Oslo, Oslo, Norway
4. Medical student at the Faculty of Medicine, University of Oslo, Oslo, Norway
5. Oslo Centre for Biostatistics and Epidemiology, Oslo University Hospital, Oslo, Norway