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Authors
Vik, Frøydis N. http://orcid.org/0000-0001-7324-0070
Grasaas, Erik
Polspoel, Maaike E. M.
Røed, Margrethe
Hillesund, Elisabet R.
Øverby, Nina C.
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Funding
Funding for this research was provided by:
Universitetet i Agder
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Article History
Received: 21 October 2020
Accepted: 5 April 2021
First Online: 20 April 2021
Declarations
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: The study was approved by the Norwegian Centre for Research Data 29/06/2017, ref.: 48643, and by the Faculty ethics committee and has been conducted in line with the Helsinki Declaration of 1985, revised in 2008. The study was voluntary, and written consent was obtained from all parents when they chose to sign up for participation.
: Not applicable.
: The authors declare that they have no competing interests.
