Funding for this research was provided by:
Forskningsrådet om Hälsa, Arbetsliv och Välfärd (2014-1743)
Received: 7 June 2018
Accepted: 26 March 2019
First Online: 3 April 2019
Ethics approval and consent to participate
: This study was approved by the regional ethical review board in Stockholm, Sweden (Dnr 2010/1185–31/5). The present study is based on retrospective analysis of registry data. For this type of study formal consent is not required.
: Not applicable.
: The authors declare that they have no competing interests.
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