Funding for this research was provided by:
Universitetet i Tromsø
Text and Data Mining valid from 2019-01-10
Received: 24 June 2018
Accepted: 12 December 2018
First Online: 10 January 2019
Ethics approval and consent to participate
: The Regional Ethical Committee of Northern Norway has approved the study (REK Nord 2014/920). All patients provided written informed consent to participate.
: Not applicable.
: The authors declare that they have no competing interests.
: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.