Affiliation: | 1. Department of Paediatrics, Oslo University Hospital, Oslo, Norway;2. Faculty of Medicine, Institute of Clinical Medicine, University of Oslo, Oslo, Norway Østfold Hospital Trust, Sarpsborg, Norway;3. Department of Paediatrics, Oslo University Hospital, Oslo, Norway Faculty of Medicine, Institute of Clinical Medicine, University of Oslo, Oslo, Norway;4. Department of Paediatrics, Oslo University Hospital, Oslo, Norway Faculty of Medicine, Institute of Clinical Medicine, University of Oslo, Oslo, Norway Innlandet Hospital Trust, Elverum, Norway;5. Department of Paediatrics, Oslo University Hospital, Oslo, Norway VID Specialized University, Oslo, Norway;6. Department of Dermatology, Oslo University Hospital, Oslo, Norway;7. Furst Medical Laboratory, Oslo, Norway |