Funding for this research was provided by:
Forskningsrådet om Hälsa, Arbetsliv och Välfärd (2015-00742)
Text and Data Mining valid from 2018-11-06
Received: 15 April 2018
Accepted: 22 October 2018
First Online: 6 November 2018
Ethics approval and consent to participate
: This project was evaluated and approved by the regional ethical review board in Stockholm, Sweden. The ethical committee approval number is 2007/762–31. The ethical review board approved the study and waived the requirement that informed consent of research subjects should be obtained.
: Not applicable.
: The authors declare that they have no competing interests.
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