Funding for this research was provided by:
Forskningsrådet om Hälsa, Arbetsliv och Välfärd (2014-05134)
Text and Data Mining valid from 2019-11-25
Received: 29 March 2019
Accepted: 30 October 2019
First Online: 25 November 2019
Ethics approval and consent to participate
: This study was approved by the Uppsala regional ethics review board (dnr 2017–342). A waiver of informed consent was granted by the review board.
: Not applicable.
: The authors declare that they have no competing interests.