Lorentzen, Jolanta
Medhus, Asle W.
Hertel, Jens Kristoffer
Borgeraas, Heidi
Karlsen, Tor-Ivar
Kolotkin, Ronette L.
Sandbu, Rune
Sifrim, Daniel
Svanevik, Marius
Hofsø, Dag
Seip, Birgitte
Hjelmesæth, Jøran
Funding for this research was provided by:
Universitetet i Oslo (PhD grant)
Article History
First Online: 19 March 2020
Compliance with Ethical Standards
: The study was registered in an international trial register (Clinical Trials. gov) ExternalRef removed, and a protocol paper has been published previously [CitationRef removed].
: The authors declare that they have no conflict of interest.
: The study protocol was approved by the Regional Committees for Medical and Health Research Ethics in Norway (ref: 2012/1427/REK Sør-Øst B). All procedures performed in studies involving human participants were in accordance with the ethical standards of the institutional and/or national research committee and with the 1964 Helsinki declaration and its later amendments or comparable ethical standards.
: Informed consent was obtained from all participants included in the study.