Funding for this research was provided by:
Stockholms Läns Landsting
Public Health Agency of Sweden
Article History
Received: 13 November 2017
Accepted: 28 March 2018
First Online: 10 April 2018
Ethics approval and consent to participate
: Ethical approval for the study was granted by the by the Regional Ethical Review Board in Stockholm (dr nr 2013/877–31/1), and an approval of the extension of the evaluation period of participating children (2014/327–32). Informed consent has been obtained from parents for participation in the study.
: Not applicable
: The authors declare that they have no competing interests.
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