Received: 9 August 2021
Accepted: 3 January 2022
First Online: 13 January 2022
: This project was performed in accordance with the Declaration of Helsinki. All participants approved participation and signed a written informed consent form. A guardian gave written informed consent for participants under the age of 16 years. The Regional Committee for Medical and Health Research Ethics in Norway (2019/599/REK Nord) and the Norwegian Centre for Research Data (954769) approved the current study.
: Not applicable.
: The authors declare they have no competing interests.