Hustoft, Merethe http://orcid.org/0000-0001-6304-9280
Biringer, Eva http://orcid.org/0000-0003-0933-1079
Gjesdal, Sturla http://orcid.org/0000-0002-3971-767X
Moen, Vegard Pihl http://orcid.org/0000-0001-7063-0049
Aβmus, Jörg http://orcid.org/0000-0002-1688-8556
Hetlevik, Øystein http://orcid.org/0000-0001-8912-3426
Article History
Accepted: 23 May 2019
First Online: 29 May 2019
Compliance with ethical standards
:
: The authors declare that they have no conflict of interest.
: Not applicable.
: The study was approved by the Regional Ethics Committee West in Norway (REK-No. 2014-1636).All procedures were in accordance with the ethical standards of the Regional research committee and with the Declaration of Helsinki 1964 and it later amendments.
: Informed consent was obtained from all individual participant included in the study, also accepting the linkage to register data.