Funding for this research was provided by:
Region Östergötland ((LIO-537411))
Text and Data Mining valid from 2018-04-10
Received: 10 November 2017
Accepted: 23 March 2018
First Online: 10 April 2018
Ethics approval and consent to participate
: The study was approved by the regional ethical vetting board in Linköping (dnr: 2011/350–31) and all participants signed informed consent in accordance with the Helsinki declaration.
: Not applicable.
: The authors declare that they have no competing interests.
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