1. Children's Surgical Department, Division of Head, Neck and Reconstructive Surgery Oslo University Hospital Norway
2. Institute of Health and Society University of Oslo Oslo Norway
3. Department of Research and Development, Division of Emergencies and Critical Care Oslo University Hospital Oslo Norway
4. Department of Nursing and Health Promotion, Faculty of Health Sciences OsloMet – Oslo Metropolitan University Oslo Norway
5. Division of Head, Neck and Reconstructive Surgery Oslo University Hospital Oslo Norway
6. Division of Emergencies and Critical Care Oslo University Hospital Oslo Norway
7. Pain Treatment ServiceAstrid Lindgren Children's Hospital, Karolinska University Hospital Stockholm Sweden
8. Division of Pediatric and Adolescent Medicine Oslo University Hospital Oslo Norway
9. Institute of Clinical Medicine University of Oslo Oslo Norway
10. School of Health and Social Care London South Bank University London UK