Funding for this research was provided by:
FORTE Research Council (2016-00960)
Text and Data Mining valid from 2018-11-22
Received: 6 February 2018
Accepted: 7 November 2018
First Online: 22 November 2018
Ethics approval and consent to participate
: The study protocol and data handling procedures were approved by the Regional Ethical Review Board of Northern Sweden, Umeå (Dnr 2013/332/31). All study participants provided written informed consent, and the study was conducted in accordance with the Declaration of Helsinki.
: Not applicable.
: The authors declare that they have no competing interests.
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