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Authors
Helle, Christine https://orcid.org/0000-0002-2113-9218
Hillesund, Elisabet R.
Wills, Andrew K.
Øverby, Nina C.
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Funding
Funding for this research was provided by:
The Eckbo foundation https://www.eckbos-legat.no/
University of Agder
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Article History
Received: 20 July 2018
Accepted: 12 December 2018
First Online: 3 January 2019
Ethics approval and consent to participate
: The study is conducted in accordance with the Helsinki Declaration of 1975 as revised in 1983. The Norwegian Centre for Research Data evaluated and approved the study ( ). Informed consent from all participating parents was obtained upon registration.
: Not applicable.
: The authors declare that they have no competing interests.
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