Article History
Received: 20 August 2018
Revised: 10 September 2019
Accepted: 11 September 2019
First Online: 24 September 2019
Compliance with ethical standards
:
: The authors declares that they have no conflict of interest.
: The study was approved by the The Norwegian Data Inspectorate.
: Informed consent was obtained from all participants. Additionally, parents were sent an informational letter with the option to opt their child out of the study.