Funding for this research was provided by:
Norges Forskningsråd (256681)
Text and Data Mining valid from 2020-04-03
Received: 1 July 2019
Accepted: 24 March 2020
First Online: 3 April 2020
Ethics approval and consent to participate
: The Regional Committees for Research Ethics in Norway found that the study was not regulated by the Health Research Act. The Norwegian Centre for Research Data approved the study in two phases (Phase 1: NSD, ID 52324; Phase 2: NSD, ID 54855). The study followed the Helsinki Declaration, and all participants gave their written informed consent.
: Not applicable.
: The authors declare that they have no competing interests.