1. Department of Food and NutritionUmeå University, Umeå, Sweden
2. School of EducationUniversity of Iceland, Reykjavik, Iceland
3. Turku Institute of Child and Youth ResearchUniversity of Turku, Turku, Finland
4. Faculty of EducationBergen University College, Bergen, Norway
5. Department of PsychologyUmeå University, Umeå, Sweden
6. Unit for Nutrition ResearchLandspitali - The National University Hospital of Iceland and Faculty of Food Science and Nutrition, School of Health Sciences, University of Iceland, Reykjavík, Iceland