Funding for this research was provided by:
Text and Data Mining valid from 2020-02-18
Received: 31 July 2019
Accepted: 6 February 2020
First Online: 18 February 2020
Ethics approval and consent to participate
: This study was approved by the Stockholm Regional Ethical Review Board (No. 2014/1374-31/5).
: Not applicable.
: The authors declare that they have no competing interests.