Funding for this research was provided by:
Sogn og Fjordane University College (NA)
Sogn og Fjordane County municipality (NA)
Text and Data Mining valid from 2020-01-02
Received: 5 July 2019
Accepted: 12 December 2019
First Online: 2 January 2020
Ethics approval and consent to participate
: Parents of all participating children received oral and written information about the study and provided written consent prior to testing. The Norwegian Centre for Research Data (NSD) approved the study (reference number 39061 and 48016). For Norwegian projects that are not considered medical research, issues concerning data and privacy protection are handled by the NSD according to the Personal Information Act of 2018 and former legislation. In such cases, no requirement of ethical preapproval from a national or regional committee is required.
: Not applicable.
: The authors declare that they have no competing interests.