Funding for this research was provided by:
Helse Sør-Øst RHF
The National Science Foundation Graduate Research Fellowship (DGE-1356109)
Text and Data Mining valid from 2019-01-17
Received: 16 August 2018
Accepted: 5 December 2018
First Online: 17 January 2019
Ethics approval and consent to participate
: The Regional Committees for Medical and Health Research Ethics approved the study, and written consent was obtained from all participants.
: Not applicable.
: The authors declare that they have no competing interests.
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