Institution: | 1. Department of Neonatal Intensive Care, Oslo University Hospital, Norway;2. Department of Pediatric Neurology, Oslo University Hospital, Norway;3. Institute of Clinical Medicine, University of Oslo, Norway;4. Department of Pediatrics and Adolescence Medicine, Oslo University Hospital, Norway;5. Department of Ophthalmology, Oslo University Hospital, Norway;6. Department of Clinical Sciences, Pediatrics, Umea University, Sweden;7. Oslo Centre of Biostatistics and Epidemiology, Oslo University Hospital, Norway |