Funding for this research was provided by:
OsloMet- Oslo Metropolitan University (130209)
Text and Data Mining valid from 2019-11-04
Received: 15 March 2019
Accepted: 3 September 2019
First Online: 4 November 2019
Ethics approval and consent to participate
: The project proposal has been approved by The Regional Committee for Medical Research Ethics in South East Norway (Ref. 2014/2050). Written informed consent was obtained from all participants included in the analyses, and the project is conducted according to the World Medical Association Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.