Fjermestad, Krister W. http://orcid.org/0000-0001-7501-0033
Ditlefsen, Nina
Unsvåg, Marie H.
Öst, Lars-Göran
Havik, Odd E.
Wergeland, Gro Janne
Article History
Accepted: 20 November 2021
First Online: 10 December 2021
Compliance with Ethical Standards
:
: The authors declare no competing interests.
: The research involved humans aged 8 years and older. The study was approved by the Regional Committee for Medical and Health Research Ethics – Western Norway. We declare that principles of research ethics involving children were followed in all parts of the study.
: All participants provided informed consent. Parents and children > 12 years provided written informed consent. Participants aged 8–12 years provided verbal assent and were only included if parents had provided written consent.