Funding for this research was provided by:
Vetenskapsrådet (K2009-61P-21304-04-4; K2009-61X-21305-01-1)
Co-ordination of the Swedish Drug Policy (Dnr. 238/2006:18)
Text and Data Mining valid from 2019-04-11
Received: 17 December 2017
Accepted: 15 March 2019
First Online: 11 April 2019
Ethics approval and consent to participate
: The study was approved by the Regional ethical review board in Stockholm (Dnr 2007/174–31, Dnr 2008/1086–31/5). The Regional Ethical Review Board can waive the requirement to consult in these type of large register studies, and for this project stated that the consent to participate was not applicable. Consent to participate: ‘Not applicable’.
: ‘Not applicable’.
: The authors declare that they have no competing interests.
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