1. Department of Child and Adolescent Health Services; Telemark Hospital; Skien Norway
2. Division of Nursing; Department of Neurobiology, Care Sciences and Society; Karolinska Institutet; Stockholm Sweden
3. Department of Women's and Children's Health; University Children's Hospital Uppsala; Uppsala Sweden
4. Department of Pediatrics; Haukeland University Hospital; Bergen Norway
5. Department of Paediatrics; Faculty of Medicine and Health; Örebro University; Örebro Sweden