Funding for this research was provided by:
Text and Data Mining valid from 2018-09-13
Received: 11 December 2017
Accepted: 24 July 2018
First Online: 13 September 2018
Ethics approval and consent to participate
: The, Ethical Review Board in Linköping approved the study and written consents were obtained from participants before enrolment (registration number: 2013/17/31).
: Not applicable
: The authors declare that they have no competing interests.
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