Funding for this research was provided by:
Norrbottens Läns Landsting
Received: 4 June 2018
Accepted: 29 October 2018
First Online: 13 December 2018
Ethics approval and consent to participate
: Ethical approval for the study was obtained from the regional ethic committee at Umeå University (D-nr 2014/143–31). Consent to participate for the included patients in the study was not required in the ethical approval.
: Not applicable.
: The authors declare that they have no competing interests.
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