Khan, Umael http://orcid.org/0000-0002-6280-1837
Omdal, Tom R.
Greve, Gottfried
Grong, Ketil
Matre, Knut
Funding for this research was provided by:
University of Bergen
Article History
Received: 26 July 2020
Accepted: 23 December 2020
First Online: 25 January 2021
Compliance with Ethical Standards
:
: None of the authors have any declarations of interest.
: We obtained written informed consent from parents.
: We obtained written informed consent from parents.
: We obtained the approval of The Regional Committee for Medical and Health Research Ethics (No. 2015/1918).