1. Department of Pediatric Research, Division of Paediatric and Adolescent Medicine, Oslo University Hospital Rikshospitalet, 0372 Oslo, Norway
2. Department of Health, Nutrition and Management, Oslo Metropolitan University, 0130 Oslo, Norway
3. Institute of Clinical Medicine, University of Oslo, 0450 Oslo, Norway
4. Department of Pediatrics, Division of Neonatology, Beatrix Children’s Hospital, University Medical Center Groningen, University of Groningen, 9713 GZ Groningen, The Netherlands
5. Department of Pediatrics, Vestfold Hospital Trust, 3103 Tønsberg, Norway
6. Faculty of Health, Welfare and Organization, Østfold University College, 1757 Halden, Norway