Høyvik, Ann C. http://orcid.org/0000-0002-5286-8384
Lie, Birgit
Grjibovski, Andrej M.
Willumsen, Tiril
Article History
First Online: 30 June 2018
Compliance with Ethical Standards
:
: All authors declare that they have no conflict of interest.
: All procedures performed in studies involving human participants were in accordance with the ethical standards of the Norwegian Ethics Committee and with the 1964 Helsinki declaration and its later amendments.