1. Department of Paediatrics, University Hospital of North Norway, Tromsø, Norway
2. Paediatric Research Group, Faculty of Health Sciences, UiT, The Arctic University of Norway, Tromsø, Norway
3. Norwegian Institute of Public Health, PO Box 4404, Nydalen, N-0403 Oslo, Norway
4. University College of Southeast Norway, Notodden, Norway
5. Division of Paediatric Pharmacology and Pharmacometrics, University of Basel Children’s Hospital, Basel, Switzerland
6. Division of Clinical Pharmacology, Children’s National Health System, Washington, DC, USA