Mykland, Martin Syvertsen http://orcid.org/0000-0003-1696-8123
Bjørk, Marte Helene
Stjern, Marit
Omland, Petter Moe
Uglem, Martin
Sand, Trond
Article History
Received: 24 January 2019
Accepted: 17 June 2019
First Online: 9 July 2019
Ethics approval and consent to participate
: We obtained written consent from all the subjects. The regional ethical committee approved of the study.
: Not applicable.
: All authors declare no conflict of interest regarding this study and article.