Funding for this research was provided by:
This study was funded by The Research Council of Norway (256644/H10)
Text and Data Mining valid from 2020-03-18
Received: 9 April 2019
Accepted: 17 February 2020
First Online: 18 March 2020
Ethics approval and consent to participate
: The Norwegian Regional Ethics Committee approved this study (2016/2215 REK B). We obtained written informed consent from all of the participants.
: Not applicable.
: The authors declare that they have no competing interests.