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The authors are with the University of Oslo, Oslo, Norway. Lars Lien and Espen Bjertness are with the Section for Preventive Medicine and Epidemiology, Institute of General Practice and Community Medicine. Nanna Lien is with the Department for Nutritional Research, Institute of Basic Medical Sciences. Magne Thoresen is with the Department of Biostatistics, Institute of Basic Medical Sciences. Sonja Heyerdahl is with the Regional Centre for Child and Adolescent Psychiatry.
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