Received: 8 April 2020
Accepted: 2 May 2020
First Online: 27 May 2020
Compliance with Ethical Standards
: The authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were approved by the Norwegian Centre for Research Data and were in accordance with the ethical standards of the Norwegian National Research Ethics Committees and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all individual participants included in the study. Parents of students younger than age 18 were given the option to decline their children’s participation.