Affiliation: | 1. Department of Pediatrics, Division of Haematology and Oncology, Cardiovascular Institute, Sahlgrenska Academy at Göteborg University, Göteborg, Sweden;2. Department of Medicine, Division of Clinical Physiology, Cardiovascular Institute, Sahlgrenska Academy at Göteborg University, Göteborg, Sweden;3. Department of Pediatrics, Division of Cardiology, Cardiovascular Institute, Sahlgrenska Academy at Göteborg University, Göteborg, Sweden;4. Göteborg Paediatric Growth Research Centre, Institute of Clinical Sciences, Cardiovascular Institute, Sahlgrenska Academy at Göteborg University, Göteborg, Sweden Department of Pediatrics, Landspitali University Hospital, Reykjavik, Iceland |