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Article History

Received: 18 April 2018

Accepted: 23 July 2018

First Online: 9 August 2018

Ethics approval and consent to participate

: Ethics and consent procedures were approved for all three samples: for the Malmö sample, by the Regional Ethical Board in Lund (approval number 2009/362), and for the Stockholm samples, by the Regional Ethical Board in Stockholm (approval numbers 137 2011/1329–31/4, 2012/1104–32, 2012/ 2005–32, 2013/486–32 and 2013/1628–31/2). In the Malmö sample and the clinical sample, mothers/caregivers provided written informed consent. In the school sample, data were collected anonymously, such that no informed consent was required.

: Not applicable.

: The authors declare that they have no competing interests.

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