Funding for this research was provided by:
Bergen Heart Foundation University of Bergen
University of Bergen
Article History
Received: 16 November 2020
Accepted: 22 February 2021
First Online: 12 March 2021
Compliance with ethical standards
:
: None of the authors have any declarations of interest.
: We obtained the approval of The Regional Committee for Medical and Health Research Ethics (No. 2015/1918).
: We obtained written informed consent from parents. Consent for publication: We obtained written informed consent from parents.
: This research did not receive any specific grant from funding agencies in the public, commercial, or not-for-profit sectors. We obtained consent from parents as well as the approval of The Regional Committee for Medical and Health Research Ethics.