Received: 6 September 2022
Accepted: 10 January 2023
First Online: 24 January 2023
: The study was approved by the Regional Committee for Medical and Health Research Ethics and the Norwegian Social Sciences Data Services (REK 2.2006.2066). All procedures are in accordance with the ethical standards of the institution, the research committee and the Declaration of Helsinki. Written informed consent was obtained from all parents/or legal guardian.
: Not applicable.
: The authors declare that they have no competing interests.