Funding for this research was provided by:
Martin Rinds Stiftelse (-)
Stiftelsen Sven Jerrings Fond (-)
Skandia Insurance (-)
Text and Data Mining valid from 2019-04-11
Received: 10 January 2019
Accepted: 22 March 2019
First Online: 11 April 2019
Ethics approval and consent to participate
: Informed consent was, written consent was collected from all parents of participating children. Ethical approval has been granted to the study by the Regional Ethical Review Board in Stockholm, Sweden (2012/877–31/5).
: Not applicable.
: The authors declare that they have no competing interests.
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