Text and Data Mining valid from 2018-02-07
Received: 12 July 2017
Accepted: 24 January 2018
First Online: 7 February 2018
Ethics approval and consent to participate
: The study was conducted in accordance with the Declaration of Helsinki and the Regional Ethical Review Board at the Faculty of Health Sciences, Linköping, Sweden approved the protocol (Reference: 2012/348–31(2012–11-14) for the paper version and 2015/226/32 for the electronic version).
: Informed consent was obtained from all participants.
: The authors declare that they have no competing interests.
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