Received: 9 December 2019
Accepted: 18 October 2020
First Online: 4 November 2020
Ethics approval and consent to participate
: The Regional Committee for Medical & Health Research Ethics found the research project to be outside the remit of the Act on Medical and Health Research; therefore, the study could be implemented without its approval (ref no. 2015/1034). Approval from the Norwegian centre for research data was given because no personal or sensitive information was collected or stored (ref no. 44760/3). Written consent was obtained from all parents based on both oral and written information about the project.
: Not applicable.
: The authors have no conflict of interest to disclose.