1. Department of Neonatology, St Olav’s Hospital, Trondheim University Hospital, Trondheim, Norway;
2. Department of Clinical Science, Faculty of Medicine and Dentistry, University of Bergen, Bergen, Norway;
3. Innlandet Hospital Trust, Brumunddal, Norway;
4. Department of Pediatric Research, Oslo University Hospital, University of Oslo, Oslo, Norway; and
5. Department of Clinical and Molecular Medicine, Norwegian University of Science and Technology, Trondheim, Norway