Skromme, Kaia http://orcid.org/0000-0001-9029-5807
Vollsæter, Maria
Øymar, Knut
Markestad, Trond
Halvorsen, Thomas
Funding for this research was provided by:
Universitetet i Bergen
Helse Vest Regionalt Helseføretak
Haukeland University Hospital
Article History
Received: 7 March 2017
Accepted: 1 February 2018
First Online: 7 March 2018
Ethics approval and consent to participate
: The study was based on written parental consent, which was received for all participants in the study, and was approved by the Regional committee on Medical Research Ethics and the Norwegian Data Inspectorate (Reference number: 2009/2271; Date 10.12.09).
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.