Funding for this research was provided by:
Norges Forskningsråd (ID: 213477)
Helse Nord RHF (NO)
Text and Data Mining valid from 2018-08-06
Received: 15 March 2018
Accepted: 15 July 2018
First Online: 6 August 2018
Ethics approval and consent to participate
: The study is approved by the Regional Committee on Medical and Health Research Ethics South-East (reg. no. 2012/1176) and by the Privacy Ombudsman. Participants received an information letter, and gave their consent to participate before answering the questionnaire.
: Not applicable.
: One co-author, Torleif Ruud, is a member of the editorial board (Associate Editor) of this journal, but the decision and process of submission was completely transparent and the authors declare that they have no competing interests.
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