Funding for this research was provided by:
Text and Data Mining valid from 2020-03-18
Received: 12 November 2018
Accepted: 12 March 2020
First Online: 18 March 2020
Ethics approval and consent to participate
: Ethical approval was given by the Regional Ethical Review Board in Gothenburg, Sweden (Ref: 678-14).
: Not applicable.
: The authors declare that they have no competing interests.