1. Department of Child and Adolescent Health Services; Telemark Hospital; Skien Norway
2. Division of Nursing; Department of Neurobiology, Care Sciences and Society; Karolinska Institute; Stockholm Sweden
3. Department of Research; Telemark Hospital; Skien Norway
4. Department of Pediatric and Adolescent Medicine; Akershus University Hospital; Lørenskog Norway
5. Department of Clinical Science, Intervention and Technology; Karolinska Institute; Stockholm Sweden
6. Department of Anesthesia and Intensive Care; Karolinska University Hospital Huddinge; Huddinge Sweden