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Article History

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.

: Springer Nature remains neutral with regard to jurisdictional claims in published maps and institutional affiliations.